Student or educator? Sign up with your school email and get 6 months of Pro free.
CoChat
Sign Up
Cited by 526

The DOI matches its Crossref record.

Calibrating Rates of Early Cambrian Evolution

Open access
Bowring, Samuel A., Grotzinger, John P., Isachsen, Clark E., Knoll, Andrew H., Pelechaty, Shane M., Kolosov, Peter·1993·Science
DOI 10.1126/science.11539488
Open this paper in CoChat — free account

Abstract

An explosive episode of biological diversification occurred near the beginning of the Cambrian period. Evolutionary rates in the Cambrian have been difficult to quantify accurately because of a lack of high-precision ages. Currently, uranium-lead zircon geochronology is the most powerful method for dating rocks of Cambrian age. Uranium-lead zircon data from lower Cambrian rocks located in northeast Siberia indicate that the Cambrian period began at ∼544 million years ago and that its oldest (Manykaian) stage lasted no less than 10 million years. Other data indicate that the Tommotian and Atdabanian stages together lasted only 5 to 10 million years. The resulting compression of Early Cambrian time accentuates the rapidity of both the faunal diversification and subsequent Cambrian turnover.

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.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1126/science.11539488

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.

A few free checks a day · papers already verified open instantly · results are public

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

No references could be resolved yet.

Research works printed but not linked: 35

  1. BENUS, A. P., NEW YORK STATE MUSEUM BULLETIN 463: 8 (1988).
  2. BOWERING, S.A., AMERICAN JOURNAL OF SCIENCE 292: 1 (1992). · DOI
  3. COMPSTON, W, ZIRCON U-PB AGES FOR THE EARLY CAMBRIAN TIME-SCALE, JOURNAL OF THE GEOLOGICAL SOCIETY 149: 171 (1992). · DOI · Paper page
  4. Compston, W., Journal of Geophysical Research: Solid Earth 89: B525 (1984).
  5. COOPER, J.A., ION-PROBE ZIRCON DATING OF A MID-EARLY CAMBRIAN TUFF IN SOUTH-AUSTRALIA, JOURNAL OF THE GEOLOGICAL SOCIETY 149: 185 (1992). · DOI
  6. Cowie, J. W., The Precambrian-Cambrian Boundary: 186 (1989).
  7. Crimes, T. P., The Precambrian-Cambrian Boundary: 166 (1989).
  8. DROSER, M.L., TRENDS IN DEPTH AND EXTENT OF BIOTURBATION IN CAMBRIAN CARBONATE MARINE ENVIRONMENTS, WESTERN UNITED-STATES, GEOLOGY 16: 233 (1988).
  9. 10.1017/S0094837300011994 · DOI
  10. Karlova, G. A., First Findings of Skeletal Fauna in the Turkut Formation of the Olenek Uplift 292: 204 (1987).
  11. KHOMENTOVSKY, V. V., GEOLOGICAL MAGAZINE 123: 333 (1966).
  12. KHOMENTOVSKY, V.V., THE VENDIAN SYSTEM OF SIBERIA AND A STANDARD STRATIGRAPHIC SCALE, GEOLOGICAL MAGAZINE 123: 333 (1986). · DOI
  13. Krasilshchikov, A. A., Geology of the USSR Western Part of the Yakutian ASSR 18: 91 (1970).
  14. KROGH, T. E., GEOCHIMICA ET COSMOCHIMICA ACTA 37: 485 (1973). · DOI · Paper page
  15. KROGH, T.E., IMPROVED ACCURACY OF U-PB ZIRCON AGES BY THE CREATION OF MORE CONCORDANT SYSTEMS USING AN AIR ABRASION TECHNIQUE, GEOCHIMICA ET COSMOCHIMICA ACTA 46: 637 (1982). · DOI · Paper page
  16. KRYLOV, I.N., SOV GEOL 7: 85 (1971).
  17. Landing, E., Origin and Early Evolution of the Metazoa: 283 (1992).
  18. Meshkova, N. P., Problems of Paleontology and Biostratigraphy of the Lower Cambrian of Siberia and the Far East: 194 (1973).
  19. Missarzhevsky, V. V., Problems of Upper Proterozoic and Phanerozoic Stratigraphy: 59 (1989).
  20. Moczydlowska M. Acritarch Biostratigraphy of the Lower Cambrian and the Precambrian-Cambrian Boundary in Southeastern Poland 29 (1991). · doi:10.18261/8200374742-1991
  21. ODIN, G.S., NUMERICAL DATING OF PRECAMBRIAN CAMBRIAN BOUNDARY, NATURE 301: 21 (1983). · DOI
  22. OGURTSOVA, R. N., INTERNATIONAL GEOLOGY REVIEW 19: 921 (1977). · doi:10.1080/00206817709471090
  23. PATCHETT, P.J., RB-SR WHOLE-ROCK ISOCHRON AGES OF LATE PRECAMBRIAN TO CAMBRIAN IGNEOUS ROCKS FROM SOUTHERN BRITAIN, JOURNAL OF THE GEOLOGICAL SOCIETY 137: 649 (1980). · DOI
  24. 10.1017/S0094837300005649 · DOI
  25. Rozanov, A. Y., Origin and Early Evolution of the Metazoa: 205 (1992).
  26. SAMSON, S.D., GEOL SOC AM ABSTR 24: 113 (1992).
  27. SEPKOSKI, J.J., KINETIC-MODEL OF PHANEROZOIC TAXONOMIC DIVERSITY .1. ANALYSIS OF MARINE ORDERS, PALEOBIOLOGY 4: 223 (1978). · DOI · Paper page
  28. SEPKOSKI, J.J., KINETIC-MODEL OF PHANEROZOIC TAXONOMIC DIVERSITY .2. EARLY PHANEROZOIC FAMILIES AND MULTIPLE EQUILIBRIA, PALEOBIOLOGY 5: 222 (1979). · DOI · Paper page
  29. 10.1017/S0094837300011969 · DOI · Paper page
  30. Sepkoski, J. J., The Proterozoic Biosphere: 553 (1992).
  31. STACEY, J.S., APPROXIMATION OF TERRESTRIAL LEAD ISOTOPE EVOLUTION BY A 2-STAGE MODEL, EARTH AND PLANETARY SCIENCE LETTERS 26: 207 (1975). · DOI · Paper page
  32. TUCKER, R.D., TIME-SCALE CALIBRATION BY HIGH-PRECISION U-PB ZIRCON DATING OF INTERSTRATIFIED VOLCANIC ASHES IN THE ORDOVICIAN AND LOWER SILURIAN STRATOTYPES OF BRITAIN, EARTH AND PLANETARY SCIENCE LETTERS 100: 51 (1990). · DOI
  33. TUCKER, R.D., U-PB ZIRCON AGES FOR LATE PRECAMBRIAN IGNEOUS ROCKS IN SOUTHERN BRITAIN, JOURNAL OF THE GEOLOGICAL SOCIETY 148: 435 (1991). · DOI
  34. VALENTINE, J. W., EVOLUTIONARY BIOLOGY 25: 279 (1991).
  35. WRIGHT, A.E., THE LOWER CAMBRIAN WREKIN QUARTZITE AND THE AGE OF ITS UNCONFORMITY ON THE ERCALL GRANOPHYRE, GEOLOGICAL MAGAZINE 130: 257 (1993). · DOI

Cited by

See all 526

Metadata

Authors
Bowring, S. A., Grotzinger, J. P., Isachsen, C. E., Knoll, A. H., Pelechaty, S. M., & Kolosov, P.
Venue
Science
Publisher
American Association for the Advancement of Science (AAAS)
Published
1993-09-03
Volume
261
Issue
5126
Pages
1293-1298
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
DOI
10.1126/science.11539488
OpenAlex
W2080974066
Cited by
526
References
0
FWCI
39.87
Type
journal article
Language
en
Open access
green

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: Calibrating Rates of Early Cambrian Evolution. https://app.cochat.ai/papers/10.1126/science.11539488
The paper
Bowring, S. A., Grotzinger, J. P., Isachsen, C. E., Knoll, A. H., Pelechaty, S. M., & Kolosov, P. (1993). Calibrating Rates of Early Cambrian Evolution. Science. https://doi.org/10.1126/science.11539488

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.