World's Best Scientists 2026 revealed!

D-Index & Metrics

Earth Science

D-Index
35
Citations
5568
World Ranking
7529
National Ranking
2568

Randall B. Irmis publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Randall B. Irmis sits on this spectrum.

38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38 publications 603+

This scientist: 117 publications — 20th percentile

20% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

Randall B. Irmis D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Randall B. Irmis sits on this spectrum.

30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 35 D-Index — 19th percentile

19% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

Overview

Randall B. Irmis is affiliated with the University of Utah in the United States and has a primary research focus within the field of Earth and Planetary Sciences. Their work spans several subfields, predominantly paleontology, with significant contributions also in nature and landscape conservation, geophysics, atmospheric science, and global and planetary change.

The main topics covered in their research include paleontology and evolutionary biology, evolution and paleontology studies, paleontology and stratigraphy of fossils, ichthyology and marine biology, geological and geochemical analysis, geology and paleoclimatology research, and amphibian and reptile biology.

Some of the recent papers authored or co-authored by Randall B. Irmis include:

  • Enigmatic dinosaur precursors bridge the gap to the origin of Pterosauria, 2020, Nature
  • Evidence for the Carnian Pluvial Episode in Gondwana: New multiproxy climate records and their bearing on early dinosaur diversification, 2020, Gondwana Research
  • U-Pb zircon geochronology and depositional age models for the Upper Triassic Chinle Formation (Petrified Forest National Park, Arizona, USA): Implications for Late Triassic paleoecological and paleoenvironmental change, 2020, Geological Society of America Bulletin
  • LA-ICPMS U-Pb geochronology of detrital zircon grains from the Coconino, Moenkopi, and Chinle formations in the Petrified Forest National Park (Arizona), 2020, Geochronology
  • The paleoclimatic context for South American Triassic vertebrate evolution, 2021, Journal of South American Earth Sciences

Frequent co-authors collaborating with Randall B. Irmis are:

  • Sterling J. Nesbitt
  • Adriana Cecilia Mancuso
  • Roland Mundil
  • Keegan M. Melstrom
  • Nathan D. Smith

Publication venues frequent for Randall B. Irmis include:

  • Abstracts with Programs - Geological Society of America
  • The Anatomical Record
  • Journal of South American Earth Sciences
  • Journal of Vertebrate Paleontology
  • Palaeogeography Palaeoclimatology Palaeoecology

Best Publications

  • Best practices for justifying fossil calibrations

    James F. Parham;James F. Parham;James F. Parham;Philip C. J. Donoghue;Christopher J. Bell;Tyler D. Calway

  • The origin and early radiation of dinosaurs

    Stephen L. Brusatte;Sterling J. Nesbitt;Randall B. Irmis;Richard J. Butler

  • A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs.

    Randall B. Irmis;Sterling J. Nesbitt;Kevin Padian;Nathan D. Smith

  • AXIAL SKELETON ONTOGENY IN THE PARASUCHIA (ARCHOSAURIA: PSEUDOSUCHIA) AND ITS IMPLICATIONS FOR ONTOGENETIC DETERMINATION IN ARCHOSAURS

    Randall B. Irmis

  • A Complete Skeleton of a Late Triassic Saurischian and the Early Evolution of Dinosaurs

    Sterling J. Nesbitt;Sterling J. Nesbitt;Nathan D. Smith;Nathan D. Smith;Randall B. Irmis;Randall B. Irmis;Alan H. Turner

  • The precise temporal calibration of dinosaur origins

    Claudia Alicia Marsicano;Randall Irmis;Adriana Cecilia Mancuso;Roland Mundil

  • High-resolution U-Pb ages from the Upper Triassic Chinle Formation (New Mexico, USA) support a diachronous rise of dinosaurs

    Randall B. Irmis;Roland Mundil;Jeffrey W. Martz;William G. Parker

  • Early ornithischian dinosaurs: the Triassic record

    Randall B. Irmis;William G. Parker;Sterling J. Nesbitt;Jun Liu

  • A critical re‐evaluation of the Late Triassic dinosaur taxa of North America

    Sterling J. Nesbitt;Randall B. Irmis;William G. Parker

  • Tyrant dinosaur evolution tracks the rise and fall of Late Cretaceous oceans.

    Mark A. Loewen;Randall B. Irmis;Joseph J. W. Sertich;Philip J. Currie

  • Hindlimb Osteology and Distribution of Basal Dinosauromorphs from the Late Triassic of North America

    Sterling J. Nesbitt;Randall B. Irmis;William G. Parker;Nathan D. Smith

  • The Late Triassic pseudosuchian Revueltosaurus callenderi and its implications for the diversity of early ornithischian dinosaurs

    William G Parker;Randall B Irmis;Sterling J Nesbitt;Jeffrey W Martz

  • Evaluating hypotheses for the early diversification of dinosaurs

    Randall B. Irmis

  • Delayed recovery of non-marine tetrapods after the end-Permian mass extinction tracks global carbon cycle

    Randall B. Irmis;Jessica H. Whiteside

  • Empirical evidence for stability of the 405-kiloyear Jupiter-Venus eccentricity cycle over hundreds of millions of years.

    Dennis V. Kent;Paul E. Olsen;Cornelia Rasmussen;Christopher Lepre

  • Non-dinosaurian Dinosauromorpha

    Max C. Langer;Sterling J. Nesbitt;Jonathas S. Bittencourt;Jonathas S. Bittencourt;Randall B. Irmis

  • Extreme ecosystem instability suppressed tropical dinosaur dominance for 30 million years

    Jessica H. Whiteside;Sofie Lindström;Randall B. Irmis;Randall B. Irmis;Ian J. Glasspool;Ian J. Glasspool

  • Origin of a widespread marine bonebed deposited during the middle Miocene Climatic Optimum

    Nicholas D. Pyenson;Randall B. Irmis;Jere H. Lipps;Lawrence G. Barnes

  • Caveats on the Use of Fossil Calibrations for Molecular Dating: A Comment on Near et al.

    James F. Parham;Randall B. Irmis

  • Late Triassic Tanystropheids (Reptilia, Archosauromorpha) from Northern New Mexico (Petrified Forest Member, Chinle Formation) and the Biogeography, Functional Morphology, and Evolution of Tanystropheidae

    Adam C. Pritchard;Alan H. Turner;Sterling J. Nesbitt;Randall B. Irmis

Frequent Co-Authors

Sterling J. Nesbitt
Sterling J. Nesbitt Virginia Tech
Roland Mundil
Roland Mundil Berkeley Geochronology Center
Dennis V. Kent
Dennis V. Kent Lamont-Doherty Earth Observatory
Paul E. Olsen
Paul E. Olsen Lamont-Doherty Earth Observatory
George E. Gehrels
George E. Gehrels University of Arizona
John W. Geissman
John W. Geissman The University of Texas at Dallas
Alan H. Turner
Alan H. Turner Stony Brook University
James F. Parham
James F. Parham California State University, Fullerton
Michael J. Benton
Michael J. Benton University of Bristol
Max C. Langer
Max C. Langer Universidade de São Paulo

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