Academic literature on the topic 'Post-glacial environmental change'
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Journal articles on the topic "Post-glacial environmental change"
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Glover, Katherine C., Thomas V. Lowell, Gregory C. Wiles, Donald Pair, Patrick Applegate, and Irena Hajdas. "Deglaciation, basin formation and post-glacial climate change from a regional network of sediment core sites in Ohio and eastern Indiana." Quaternary Research 76, no. 3 (November 2011): 401–10. http://dx.doi.org/10.1016/j.yqres.2011.06.004.
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AbstractMany paleoclimate and landscape change studies in the American Midwest have focused on the Late Glacial and early Holocene time periods (~ 16–11 ka), but little work has addressed landscape change in this area between the Last Glacial Maximum and the Late Glacial (~ 22–16 ka). Sediment cores were collected from 29 new lake and bog sites in Ohio and Indiana to address this gap. The basal radiocarbon dates from these cores show that initial ice retreat from the maximal last-glacial ice extent occurred by 22 ka, and numerous sites that are ~ 100 km inside this limit were exposed by 18.9 ka. Post-glacial environmental changes were identified as stratigraphic or biologic changes in select cores. The strongest signal occurs between 18.5 and 14.6 ka. These Midwestern events correspond with evidence to the northeast, suggesting that initial deglaciation of the ice sheet, and ensuing environmental changes, were episodic and rapid. Significantly, these changes predate the onset of the Bølling postglacial warming (14.8 ka) as recorded by the Greenland ice cores. Thus, deglaciation and landscape change around the southern margins of the Laurentide Ice Sheet happened ~ 7 ka before postglacial changes were felt in central Greenland.
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Munroe, Jeffrey S. "Lacustrine records of post-glacial environmental change from the Nulhegan Basin, Vermont, USA." Journal of Quaternary Science 27, no. 6 (June 6, 2012): 639–48. http://dx.doi.org/10.1002/jqs.2557.
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Munroe, Jeffrey S., and Benjamin J. C. Laabs. "Multiproxy lacustrine records of post-glacial environmental change from the Uinta Mountains, Utah, USA." GSA Bulletin 132, no. 1-2 (May 2, 2019): 48–64. http://dx.doi.org/10.1130/b35056.1.
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Abstract Twenty-one sediment cores were obtained from 20 lakes in the Uinta Mountains, Utah, USA. Depth-age models were developed using 14C dating, and sediments were analyzed for loss-on-ignition (LOI), carbon-nitrogen ratio (C:N), and grain size distribution. Although some of these cores have been considered individually in previous studies, here the entire set of cores is evaluated collectively to identify consistent patterns, commonalities, and trends in the post-glacial interval. All lakes accumulated substantially greater amounts of submicron-size clastic material before ca. 9.5 ka BP. This pattern is interpreted as a signal of prolonged landscape instability following deglaciation. Values of LOI and C:N exhibit a strong, positive correlation in nearly all lakes, indicating that organic matter accumulation is controlled by the influx of terrestrial material. In the six lakes exhibiting the strongest correlation, and featuring the most robust inflowing streams, median grain size and the abundance of sand increased between 10 and 6 ka BP, simultaneous with increases in LOI and C:N. This correspondence is interpreted as evidence for frequent high-intensity storms during the early Holocene, likely driven by enhanced monsoonal circulation. The early parts of five of the records contain a sharp increase in LOI. Lakes exhibiting this pattern are typically smaller and shallower, and are located in less rugged watersheds. Finally, all six cores from the western Uinta Mountains contain evidence for an environmental perturbation ca. 4.5 ka BP. Although the nature of this event is unclear, these lakes accumulated notably finer-grained sediment with less organic matter at this time. This analysis illuminates the post-glacial history of this strategically located mountain range, and underscores the value inherent in analyzing cores from multiple lakes when reconstructing paleoclimatic history.
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Walker, James. "The archaeology of climate change in Late and Post-Glacial North-west Europe." Antiquity 94, no. 374 (March 17, 2020): 536–38. http://dx.doi.org/10.15184/aqy.2020.27.
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Climate change regularly made the news in 2019. In the face of numerous protests around the globe, and increasingly frequent natural disasters, we appear to be entering a (perhaps overdue) stage of heightened awareness with regard to the fragility of the Earth and our impact upon it. Current concerns over the fate of our planet, and species, look set to stay, but for deep-time prehistorians, who have long contended with records of environmental change on a scale relatively unparalleled in historic times, business continues as usual. In the opening to Resilience and reorganisation of social systems during the Weichselian Lateglacial in North-west Europe, Sonja Grimm makes reference to the importance of the Club of Rome (a non-profit, non-governmental organisation) in highlighting socio-ecological stability as an issue for public concern, and one that archaeological studies such as this can contribute to and bolster. Meanwhile, Peter Moe Astrup, in his introduction to Sea-level change in Mesolithic southern Scandinavia, notes that Mesolithic people from this area would have been exposed to the consequences of global sea-level rise on a far greater scale than those predicted for our own future generations. What these volumes share is an emphasis on the importance of adaptive flexibility and the human experience in shaping our response to climate change.
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Scuderi, Louis A., and Peter J. Fawcett. "Holocene environmental change resets lichen surface dates on Recess Peak glacial deposits in the Sierra Nevada, California." Quaternary Research 80, no. 2 (September 2013): 180–88. http://dx.doi.org/10.1016/j.yqres.2013.05.009.
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Development of an accurate chronology for glacial deposits in the Sierra Nevada has long been problematic given the lack of suitable organic material for radiocarbon dating. Lichenometry initially appeared promising as ages showed an increase from cirque headwalls to down-canyon moraines. However, while Recess Peak lichen age estimates range from 2 to 3 ka, recent work shows these deposits to be at least 10 ka older. Here, we present evidence for a late Holocene reset of Recess Peak lichen ages by significant post-depositional climate change. Following late-Pleistocene deposition of Recess Peak moraines, warming through the mid-Holocene allowed forests to advance into shallow basins eliminating local inverted tree lines. This produced a partial canopy where shading killed the original post-Pleistocene crustose lichen colonies. Late-Holocene cooling resulted in forest retreat from these basins as alpine tree line fell. Lichens then recolonized the re-exposed Recess Peak deposits. We conclude that while Recess Peak lichen ages are accurate to within the dating uncertainty of the technique, existing lichen ages actually date the timing of post-mid-Holocene cooling and recolonization, and not the original emplacement of these deposits. Thus, applications of Lichenometry should consider post-depositional environmental change when interpreting the meaning of these dates.
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Whitlock, Cathy. "Post Glacial Fire Frequency and its Relation to Longterm Vegetational and Climatic Changes in Yellowstone Park." UW National Parks Service Research Station Annual Reports 14 (January 1, 1990): 187–90. http://dx.doi.org/10.13001/uwnpsrc.1990.2939.
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The paleoecologic record provides unique insights into the response of communities to environmental perturbations of different duration and intensity. Climate is a primary agent of environmental change and its long-term effect on the vegetation of the Yellowstone/Grand Teton region is revealed in a regional network of pollen records. Fire frequency is controlled by climate, and as climate changes, so too does the importance of fire in shaping and maintaining spatial patterns of vegetation. The prehistoric record of Yellowstone's Northern Range, for example, shows the response of vegetation to the absence of major fires in the last 150 years (Whitlock et al. 1991; Engstrom et al. in press). In longer records spanning the last 13,000 years, periods of frequent fires are suggested by sediments containing high percentages of lodgepole pine (Pinus contorta) and Douglas-fir (Pseudotsuga menziesii) and high amounts of charcoal (Barnosky et al. 1987; Whitlock in prep.).
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Dolby, Greer A., Ryan Hechinger, Ryan A. Ellingson, Lloyd T. Findley, Julio Lorda, and David K. Jacobs. "Sea-level driven glacial-age refugia and post-glacial mixing on subtropical coasts, a palaeohabitat and genetic study." Proceedings of the Royal Society B: Biological Sciences 283, no. 1843 (November 30, 2016): 20161571. http://dx.doi.org/10.1098/rspb.2016.1571.
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Using a novel combination of palaeohabitat modelling and genetic mixture analyses, we identify and assess a sea-level-driven recolonization process following the Last Glacial Maximum (LGM). Our palaeohabitat modelling reveals dramatic changes in estuarine habitat distribution along the coast of California (USA) and Baja California (Mexico). At the LGM (approx. 20 kya), when sea level was approximately 130 m lower, the palaeo-shoreline was too steep for tidal estuarine habitat formation, eliminating this habitat type from regions where it is currently most abundant, and limiting such estuaries to a northern and a southern refugium separated by 1000 km. We assess the recolonization of estuaries formed during post-LGM sea-level rise through examination of refugium-associated alleles and approximate Bayesian computation in three species of estuarine fishes. Results reveal sourcing of modern populations from both refugia, which admix in the newly formed habitat between the refuges. We infer a dramatic peak in habitat area between 15 and 10 kya with subsequent decline. Overall, this approach revealed a previously undocumented dynamic and integrated relationship between sea-level change, coastal processes and population genetics. These results extend glacial refugial dynamics to unglaciated subtropical coasts and have significant implications for biotic response to predicted sea-level rise.
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Håkansson, S. "A review of various factors influencing the stable carbon isotope ratio of organic lake sediments by the change from glacial to post-glacial environmental conditions." Quaternary Science Reviews 4, no. 2 (1985): 135–46. http://dx.doi.org/10.1016/0277-3791(85)90017-4.
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Dube, Shiva Kant. "Glacial Lake Outburst Flood in Nepal: A Challenging Environmental Hazard and Disaster." Academic Voices: A Multidisciplinary Journal 4 (March 28, 2015): 56–67. http://dx.doi.org/10.3126/av.v4i0.12360.
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Geographically, Nepal is situated on the lap of the Himalayas occupying 0.3 percent area of Asia and 0.03 percent of the world. Recently, global climate change has invited enormous environmental hazards and disasters in the Hindu-Kush Himalayan region. Catastrophic floods originating from the outburst of glacial lakes have been recognized as one of the primary natural hazards in Nepal, making downstream areas vulnerable. Frequent severe floodscaused by glacier outburst in the Nepal Himalayas, occur once every three years. Nine potentially dangerous glaciers were identified in the Eastern and Central Himalayas during pre- and post-monsoon seasons. At national and international level, Glacial Lake Outburst Floods (GLOF) in Nepal, are receiving considerable attention. Such floods endanger thousands of people, hundreds of villages and basic infrastructure causing disasters. This paper incorporates a case of flash-flood caused by GLOF and torrential rain in India which can be taken as a lesson to mitigate/minimize massive loss of lives and property in the Nepalese context.DOI: http://dx.doi.org/10.3126/av.v4i0.12360Academic Voices Vol.4 2014: 56-67
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Le Hir, G., Y. Goddéris, Y. Donnadieu, and G. Ramstein. "A geochemical modelling study of the evolution of the chemical composition of seawater linked to a global glaciation: implications for life sustainability." Biogeosciences Discussions 4, no. 3 (June 20, 2007): 1839–76. http://dx.doi.org/10.5194/bgd-4-1839-2007.
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Abstract. The Snowball Earth theory initially proposed by Kirschvink (Kirschvink, 1992) to explain the Neoproterozoic glacial episodes, suggested that the Earth was fully ice-covered at 720 My (Sturtian episode) and 640 My (Marinoan episode). This succession of extreme climatic crises induced a stress which is considered as a strong selective pressure on the evolution of life (Hoffman et al., 1998). However recent biological records (Corsetti, 2006) do not support this theory as little change is observed in the diversity of microfossils outcrops before and after the Marinoan glacial interval. In this contribution we address this apparent paradox. Using a numerical model of carbon-alkalinity global cycles, we quantify several environmental stresses caused by a global glaciation. We suggest that during global glaciations, the ocean becomes acidic (pH~6), and unsaturated with respect to carbonate minerals. Moreover the quick transition from ice-house to greenhouse conditions implies an abrupt and large shift of the oceanic surface temperature which causes an extended hypoxia. The intense continental weathering, in the aftermath of the glaciation, deeply affects the seawater composition inducing rapid changes in terms of pH and alkalinity. We also propose a new timing for post glacial perturbations and for the cap carbonates deposition, ~2 Myr instead of 200 kyr as suggested in a previous modelling study. In terms of Precambrian life sustainability, seawater pH modifications appear drastic all along the glaciation, but we show that the buffering action of the oceanic crust dissolution processes avoids a total collapse of biological productivity. In opposite short-lived and large post-glacial perturbations are more critical and may have played a role of environmental filter suggested in the classic snowball Earth theory. Only a permissive life (prokaryotes or simple eukaryotes) may explain the relative continuity in microfossils diversity observed before, during and after Neoproterozoic glaciation events.
Books on the topic "Post-glacial environmental change"
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Vuorinen, Ilppo. Post-Glacial Baltic Sea Ecosystems. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.675.
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Post-glacial aquatic ecosystems in Eurasia and North America, such as the Baltic Sea, evolved in the freshwater, brackish, and marine environments that fringed the melting glaciers. Warming of the climate initiated sea level and land rise and subsequent changes in aquatic ecosystems. Seminal ideas on ancient developing ecosystems were based on findings in Swedish large lakes of species that had arrived there from adjacent glacial freshwater or marine environments and established populations which have survived up to the present day. An ecosystem of the first freshwater stage, the Baltic Ice Lake initially consisted of ice-associated biota. Subsequent aquatic environments, the Yoldia Sea, the Ancylus Lake, the Litorina Sea, and the Mya Sea, are all named after mollusc trace fossils. These often convey information on the geologic period in question and indicate some physical and chemical characteristics of their environment. The ecosystems of various Baltic Sea stages are regulated primarily by temperature and freshwater runoff (which affects directly and indirectly both salinity and nutrient concentrations). Key ecological environmental factors, such as temperature, salinity, and nutrient levels, not only change seasonally but are also subject to long-term changes (due to astronomical factors) and shorter disturbances, for example, a warm period that essentially formed the Yoldia Sea, and more recently the “Little Ice Age” (which terminated the Viking settlement in Iceland).There is no direct way to study the post-Holocene Baltic Sea stages, but findings in geological samples of ecological keystone species (which may form a physical environment for other species to dwell in and/or largely determine the function of an ecosystem) can indicate ancient large-scale ecosystem features and changes. Such changes have included, for example, development of an initially turbid glacial meltwater to clearer water with increasing primary production (enhanced also by warmer temperatures), eventually leading to self-shading and other consequences of anthropogenic eutrophication (nutrient-rich conditions). Furthermore, the development in the last century from oligotrophic (nutrient-poor) to eutrophic conditions also included shifts between the grazing chain (which include large predators, e.g., piscivorous fish, mammals, and birds at the top of the food chain) and the microbial loop (filtering top predators such as jellyfish). Another large-scale change has been a succession from low (freshwater glacier lake) biodiversity to increased (brackish and marine) biodiversity. The present-day Baltic Sea ecosystem is a direct descendant of the more marine Litorina Sea, which marks the beginning of the transition from a primeval ecosystem to one regulated by humans. The recent Baltic Sea is characterized by high concentrations of pollutants and nutrients, a shift from perennial to annual macrophytes (and more rapid nutrient cycling), and an increasing rate of invasion by non-native species. Thus, an increasing pace of anthropogenic ecological change has been a prominent trend in the Baltic Sea ecosystem since the Ancylus Lake.Future development is in the first place dependent on regional factors, such as salinity, which is regulated by sea and land level changes and the climate, and runoff, which controls both salinity and the leaching of nutrients to the sea. However, uncertainties abound, for example the future development of the Gulf Stream and its associated westerly winds, which support the sub-boreal ecosystems, both terrestrial and aquatic, in the Baltic Sea area. Thus, extensive sophisticated, cross-disciplinary modeling is needed to foresee whether the Baltic Sea will develop toward a freshwater or marine ecosystem, set in a sub-boreal, boreal, or arctic climate.
Book chapters on the topic "Post-glacial environmental change"
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Anderson, David E., Andrew S. Goudie, and Adrian G. Parker. "Environmental Change in Post-glacial Times." In Global Environments through the Quaternary, 154–96. Oxford University Press, 2013. http://dx.doi.org/10.1093/acprof:osobl/9780199697267.003.0005.
Full textConference papers on the topic "Post-glacial environmental change"
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Clark, Douglas, Aidan Burdick, Emma Mickelson, and Natalie K. Culhane. "TESTING POST-GLACIAL ENVIRONMENTAL CHANGE IN THE SNOWY MOUNTAINS, AUSTRALIA, WITH A SUITE OF NEW LAKE SEDIMENT CORES." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-382937.
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Sumerling, Trevor, Paul Fish, George Towler, James Penfold, John Shevelan, and Richard Cummings. "An Assessment of the Radiological Impact of Coastal Erosion of the UK Low-Level Waste Repository." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59137.
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The UK Low Level Waste Repository Ltd submitted an Environmental Safety Case for the disposal of low-level waste to our regulator, the Environment Agency, on the 1st of May 2011. This includes assessments of the long-term radiological safety of past and future disposals. A particular feature of the Low Level Waste Repository (LLWR) is that, because of its proximity to the coast, the site is vulnerable to coastal erosion. Our present understanding is that the site will be eroded on a timescale of a few hundred to a few thousand years, with consequent disruption of the repository, and dispersal of the wastes. We have undertaken a programme of scientific research and monitoring to characterise the evolution and function of the current coastal system that provides a basis for forecasting its future evolution. This has included modelling of contemporary hydrodynamics, geomorphological mapping, repeat LiDAR and aerial photographic surveys to detect patterns and rates of change, coastal inspections and reconstructions of post-glacial (i.e. last 15,000 years) sea levels and sediment budgets. Estimates of future sea-level rise have been derived from international sources and consideration given to the impact of such on the local coastline. Two alternative models of coastal recession have then been applied, one empirical and one physical-process based, taking account of the composition of Quaternary-age sediments between the coast and the site and uncertainties in future local sea level change. Comparison of the ranges of calculated times to site contact with sea-level rise indicate that the repository is most likely to be disrupted by undercutting of the engineered vaults and of the trenches. A novel and flexible radiological assessment model has been developed to analyse the impacts of the erosion of the repository and subsequent dispersal of wastes. The model represents the spatial layout of the site and distribution of radionuclides within the repository and is able to take account of a range of uncertainties. These include uncertainties related to the rate of erosion through the facility, amounts of co-erosion of geological and cap materials, alternative assumptions for residence of waste materials on the beach, alternative waste form associations, the wider dispersion of the eroded materials and marine sorption/desorption processes. Results indicate assessed annual doses and risks that are consistent with regulatory guidance levels.
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Juzwa, Nina, Tomasz Konior, and Jakub Świerzawski. "Architecture on the Edge of a City." In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002334.
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The topic concerns the revitalization of a place by the introduction of a new building whose functionality and architectural uniqueness renew and/or develop the place. To put the problem in a broader perspective - the introduction of a building with a non-threatening function and an attractive form makes a declining or stagnant place suddenly appealing again. This applies to both, the built and natural environment. The restauration of both often requires similar revitalization activities and supporting elements.The presented issue is a part of a broader study that concerns architecture as the fine art of building, covering the topic of sustainability in architectural and urban design. The so-called “human factor” is an essential element for shaping a place. It is an element of urban and architectural design of new places. By creating new and different workplaces in declining or stagnant districts, also by introducing unusual architectural forms or materiality, a place can become attractive to users. Previously declining built or natural environment - suddenly become a desirable, growing place. Contemporary international research conducted by neuroscientists confirms the importance of the desire for beauty in ones surroundings. Thus, architectural beauty becomes a vital and economically significant factor in the shaping of the built and natural environment.Present processes of revitalization are usually supported by emphasising elements that make up the “human factor”. It involves balancing the functionality and beauty of an object as important in creating a PLACE in architecture.The topic is presented on the example of architecture of the following buildings:-Gymnasium and Cultural Center in Białołęka, 2006 is located on the edge between urban and landscape areas, on the right bank of the Vistula escarpment. The architectural form reflects the natural landscape. Traditional materiality blends with the context nearly perfectly. -The small buildings of the Cultural Center, 2013, on the outskirts of Warsaw, create a contrast of geometry and materiality to the high-rise blocks of flats. In its shape and material there is a longing for tradition expressed in a balanced, non-intrusive way.-The Krzysztof Kieślowski Film School in Katowice, 2017. The university building for artistic education was tasked to create a PLACE in a declining district. It impresses with its simplicity and its materiality of the traditional material – brick that is presented in a new, changed form. - Stone Pavilion Golędzinow, 2020 is a small building that tells Warsaw residents about nature conservation. The buildings form was created in the image of a post-glacial fossil. It is an object which shape and materiality seems as if taken directly from the natural world. - Press Glass offices in Konopiska, 2021, built in an unexpected place for this type of building. It is located in a former wasteland which was turned into a golf course. The building is intended to promote the excellence of glass - it reflects the green surroundings, and its form builds the uniqueness and beauty of architecture.The co-author of this publication is the designer of the first and fifth example.
Reports on the topic "Post-glacial environmental change"
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McMartin, I., M. S. Gauthier, and A. V. Page. Updated post-glacial marine limits along western Hudson Bay, central mainland Nunavut and northern Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330940.
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A digital compilation of updated postglacial marine limits was completed in the coastal regions of central mainland Nunavut and northern Manitoba between Churchill and Queen Maud Gulf. The compilation builds on and updates previous mapping of the marine limits at an unprecedented scale, making use of high-resolution digital elevation models, new field-based observations of the marine limit and digital compilations of supporting datasets (i.e. marine deltas and marine sediments). The updated mapping also permits a first-hand, knowledgedriven interpolation of a continuous limit of marine inundation linking the Tyrrell Sea to Arctic Ocean seawaters. The publication includes a detailed description of the mapping methods, a preliminary interpretation of the results, and a GIS scalable layout map for easy access to the various layers. These datasets and outputs provide robust constraints to reconstruct the patterns of ice retreat and for glacio-isostatic rebound models, important for the estimation of relative sea level changes and impacts on the construction of nearshore sea-transport infrastructures. They can also be used to evaluate the maximum extent of marine sediments and associated permafrost conditions that can affect land-based infrastructures, and potential secondary processes related to marine action in the surficial environment and, therefore, can enhance the interpretation of geochemical anomalies in glacial drift exploration methods. A generalized map of the maximum limit of postglacial marine inundation produced for map representation and readability also constitutes an accessible output relevant to Northerners and other users of geoscience data.