New paleontological constraints on the paleogeography of the Western Interior Seaway near the end of the Cretaceous (late Campanian–Maastrichtian) with a special emphasis on the paleogeography of southern Colorado, U.S.A.
Bibliographic record
Abstract
Research Article| June 01, 2017 New paleontological constraints on the paleogeography of the Western Interior Seaway near the end of the Cretaceous (late Campanian–Maastrichtian) with a special emphasis on the paleogeography of southern Colorado, U.S.A. Keith Berry Keith Berry 1Hoehne Science Department, P.O. Box 91, Hoehne School District, Hoehne, Colorado, 81046, U.S.A email: keith.berry@hoehnesd.org Search for other works by this author on: GSW Google Scholar Author and Article Information Keith Berry 1Hoehne Science Department, P.O. Box 91, Hoehne School District, Hoehne, Colorado, 81046, U.S.A email: keith.berry@hoehnesd.org Publisher: University of Wyoming Received: 22 Aug 2016 Accepted: 01 May 2017 First Online: 28 Jul 2017 Online Issn: 1555-7340 Print Issn: 1555-7332 © 2017 University of WyomingUniversity of Wyoming Rocky Mountain Geology (2017) 52 (1): 1–16. https://doi.org/10.24872/rmgjournal.52.1.1 Article history Received: 22 Aug 2016 Accepted: 01 May 2017 First Online: 28 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Keith Berry; New paleontological constraints on the paleogeography of the Western Interior Seaway near the end of the Cretaceous (late Campanian–Maastrichtian) with a special emphasis on the paleogeography of southern Colorado, U.S.A.. Rocky Mountain Geology 2017;; 52 (1): 1–16. doi: https://doi.org/10.24872/rmgjournal.52.1.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyRocky Mountain Geology Search Advanced Search ABSTRACT There is considerable debate regarding the paleogeography of the Western Interior Seaway (WIS) near the close of the Cretaceous. To investigate this issue, the paleogeographic implications of recent advancements in the biostratigraphy of the lower to upper Maastrichtian, transitional-marine strata in the Raton Basin are explored. In southern Colorado, the western shoreline of the WIS should be shifted about 100 km farther west than current projections for the end of the early Maastrichtian. Strong marine connections among the WIS, the Gulf of Mexico, and the North Atlantic appear to have persisted at least until the end of the early Maastrichtian. A marine connection between the WIS and the Gulf of Mexico is projected to have lasted through the end of the Cretaceous. Closure of the WIS to the Arctic Ocean is projected to have occurred earlier and farther north than other models, which close the WIS to the Arctic Ocean through the formation of the Dakota Isthmus in the latest Maastrichtian. Closure of the WIS in Canada during the early late-Maastrichtian (Hoploscaphites birkelundae ammonite biozone) appears to have permitted the dispersal of land plants, such as “Cissites” panduratus and Credneria protophylloides, among landmasses previously isolated by epeiric seaways covering much of North America and western Greenland during the Late Cretaceous and is consistent with preexisting biostratigraphic constraints on the paleogeography of the WIS. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.000 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.011 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".