The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.
Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa
Abstract
The Karoo basin of South Africa exposes a succession of Upper Permian to Lower Triassic terrestrial strata containing abundant terrestrial vertebrate fossils. Paleomagnetic/magnetostratigraphic and carbon-isotope data allow sections to be correlated across the basin. With this stratigraphy, the vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permian-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Paleomagnetism: magnetic domains to geologic terranes
(1992) · Choice Reviews Online · doi:10.5860/choice.29-5708 · Cited by 980
Large Perturbations of the Carbon Cycle During Recovery from the End-Permian Extinction
Payne, J. L., Lehrmann, D. J., Wei, J., Orchard, M. J., Schrag, D. P., & Knoll, A. H. (2004) · Science · doi:10.1126/science.1097023 · Cited by 841
Erwin, D. H. (1994) · Nature · doi:10.1038/367231a0 · Cited by 692
Self-citationPattern of Marine Mass Extinction Near the Permian-Triassic Boundary in South China
Jin, Y. G., Wang, Y., Wang, W., Shang, Q. H., Cao, C. Q., & Erwin, D. H. (2000) · Science · doi:10.1126/science.289.5478.432 · Cited by 664
Self-citationComparative Earth History and Late Permian Mass Extinction
Knoll, A. H., Bambach, R. K., Canfield, D. E., & Grotzinger, J. P. (1996) · Science · doi:10.1126/science.273.5274.452 · Cited by 646
How to kill (almost) all life: the end-Permian extinction event
Benton, M. J., & Twitchett, R. J. (2003) · Trends in Ecology & Evolution · doi:10.1016/s0169-5347(03)00093-4 · Cited by 502
Becker, L., Poreda, R. J., Hunt, A. G., Bunch, T. E., & Rampino, M. (2001) · Science · doi:10.1126/science.1057243 · Cited by 388
Altered River Morphology in South Africa Related to the Permian-Triassic Extinction
Ward, P. D., Montgomery, D. R., & Smith, R. (2000) · Science · doi:10.1126/science.289.5485.1740 · Cited by 352
Self-citationConfidence intervals on stratigraphic ranges
Marshall, C. R. (1990) · Paleobiology · doi:10.1017/s0094837300009672 · Cited by 349
Twitchett, R. J., Looy, C. V., Morante, R., Visscher, H., & Wignall, P. B. (2001) · Geology · doi:10.1130/0091-7613(2001)029<0351:rascom>2.0.co;2 · Cited by 333
Cited by
Early Penguin Fossils, Plus Mitochondrial Genomes, Calibrate Avian Evolution
Slack, K. E., Jones, C. M., Ando, T., Harrison, G. L. (., Fordyce, R. E., Arnason, U., & Penny, D. (2006) · Molecular Biology and Evolution · doi:10.1093/molbev/msj124 · Cited by 283
Chapter 1 The Geochemistry of Continental Carbonates
Deocampo, D. M. (2010) · Developments in Sedimentology · doi:10.1016/s0070-4571(09)06201-3 · Cited by 77
Metadata
- Authors
- Ward, P. D., Botha, J., Buick, R., De Kock, M. O., Erwin, D. H., Garrison, G. H., Kirschvink, J. L., & Smith, R.
- Venue
- Science
- Published
- 2005-02-04
- Volume
- 307
- Issue
- 5710
- Pages
- 709-714
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1667784628
- Cited by
- 332
- References
- 22
- FWCI
- 20.31
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa. https://app.cochat.ai/papers/10.1126/science.1107068
- The paper
- Ward, P. D., Botha, J., Buick, R., De Kock, M. O., Erwin, D. H., Garrison, G. H., Kirschvink, J. L., & Smith, R. (2005). Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa. Science. https://doi.org/10.1126/science.1107068
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.