Positions

Research Areas research areas

Overview

  • I am fundamentally interested in Earth history. I am particularly interested in how climate change, tectonics, and other geological forces have influenced mammalian evolution and shaped the terrestrial sedimentary record. Recently, I have been trying to understand the causes and consequences of Paleogene "hyperthermal" events. These are short-term, large-magnitude global warming events characterized by significant perturbations to the global carbon cycle that had wide ranging effects on continental and marine ecosystems. I use a multidisciplinary approach to address problems and have experience with a variety of paleontological and geological techniques, including magnetostratigraphy, phylogenetic analysis, morphometrics, and stable isotope geochemistry. I maintain a paleomagnetics lab at UNH and have worked throughout the Rocky Mountain region, as well as in Asia (Pakistan, Kazakhstan, China), Africa (Egypt, Tanzania), and South America (Argentina, Venezuela).
  • Publications

    Academic Article

    Year Title
    2018 Synchronizing early Eocene deep-sea and continental records - cyclostratigraphic age models for the Bighorn Basin Coring Project drill coresClimate of the Past.  14:303-319. 2018
    2018 Paleomagnetism of the Cretaceous Galula Formation and implications for vertebrate evolutionJournal of African Earth Sciences.  139:403-420. 2018
    2018 Mammals from the earliest Uintan (middle Eocene) Turtle Bluff Member, Bridger Formation, southwestern Wyoming, USA, Part 3: Marsupialia and a reevaluation of the Bridgerian-Uintan North American Land Mammal Age transitionPalaeontologia Electronica2018
    2017 New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal AgesBulletin of the Geological Society of America.  129:886-903. 2017
    2017 Rock magnetic and geochemical evidence for authigenic magnetite formation via iron reduction in coal-bearing sediments offshore Shimokita Peninsula, Japan (IODP Site C0020)Geochemistry, Geophysics, Geosystems.  18:2076-2098. 2017
    2017 Repetitive mammalian dwarfing during ancient greenhouse warming events.Science Advances.  3:e1601430. 2017
    2016 Direct high-precision U-Pb geochronology of the end-Cretaceous extinction and calibration of Paleocene astronomical timescalesEarth and Planetary Science Letters.  452:272-280. 2016
    2016 Magnetic minerals as recorders of weathering, diagenesis, and paleoclimate: A core-outcrop comparison of Paleocene-Eocene paleosols in the Bighorn Basin, WY, USAEarth and Planetary Science Letters.  452:15-26. 2016
    2015 SEDIMENTARY FACIES AND DEPOSITIONAL ENVIRONMENTS OF DIVERSE EARLY PALEOCENE FLORAS, NORTH-CENTRAL SAN JORGE BASIN, PATAGONIA, ARGENTINAPalaios.  30:553-573. 2015
    2015 A strategy for cross-calibrating U-Pb chronology and astrochronology of sedimentary sequences: An example from the Green River Formation, Wyoming, USAEarth and Planetary Science Letters.  413:70-78. 2015
    2015 Two massive, rapid releases of carbon during le onset of the Palaeocene-Eocene thermal maximumNature Geoscience.  8:44-47. 2015
    2014 Stable isotope patterns found in early Eocene equid tooth rows of North America: Implications for reproductive behavior and paleoclimatePalaeogeography, Palaeoclimatology, Palaeoecology.  414:310-319. 2014
    2014 Large temperature changes on land during Early Eocene hyperthermalsRendiconti Online Societa Geologica Italiana.  31:204-205. 2014
    2014 Repetitive mammalian dwarfism associated with early Eocene carbon cycle perturbationsRendiconti Online Societa Geologica Italiana.  31:52-53. 2014
    2014 Magnetostratigraphy of the Hell Creek and lower Fort Union Formations in northeastern MontanaGeological Society of America Special Paper.  503:137-147. 2014
    2014 New age constraints for the Salamanca Formation and lower Rio Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlationsBulletin of the Geological Society of America.  126:289-306. 2014
    2013 Bighorn Basin Coring Project (BBCP): A continental perspective on early Paleogene hyperthermalsJOIDES Journal Scientific Drilling.  16:21-31. 2013
    2013 Lower Paleogene Tectonostratigraphy of Balochistan: Evidence for Time-Transgressive Late Paleocene-Early Eocene UpliftGeosciences (Switzerland).  3:466-501. 2013
    2012 Terrestrial carbon isotope excursions and biotic change during Palaeogene hyperthermalsNature Geoscience.  5:326-329. 2012
    2012 Initiation of the western branch of the East African Rift coeval with the eastern branchNature Geoscience.  5:289-294. 2012
    2012 Coring project in Bighorn Basin: Drilling phase completeEos.  93:41-42. 2012
    2012 Fine-tuning the calibration of the early to middle Eocene geomagnetic polarity time scale: Paleomagnetism of radioisotopically dated tuffs from Laramide foreland basinsBulletin of the Geological Society of America.  124:870-885. 2012
    2012 SULAIMANIUS, GEN. NOV., AND INDUSOMYS, GEN. NOV., REPLACEMENT NAMES FOR SULAIMANIA AND INDUSIUS GUNNELL, GINGERICH, UL-HAW, BLOCH, KAHN, AND CLYDE, 2008, PREOCCUPIED NAMESJournal of Vertebrate Paleontology.  32:975-975. 2012
    2011 Asian early Paleogene chronology and mammalian faunal turnover eventsVertebrata PalAsiatica.  49:1-28. 2011
    2010 New Paleomagnetic and Stable-Isotope Results from the Nanxiong Basin, China: Implications for the K/T Boundary and the Timing of Paleocene Mammalian TurnoverJournal of Geology.  118:131-143. 2010
    2008 An integrated stratigraphic record from the Paleocene of the Chijiang Basin, Jiangxi Province (China): Implications for mammalian turnover and Asian block rotationsEarth and Planetary Science Letters.  269:553-563. 2008
    2008 Basin-wide magnetostratigraphic framework for the Bighorn Basin, Wyoming (vol 119, pg 848, 2007)Bulletin of the Geological Society of America.  120:1088-1088. 2008
    2008 New primates (Mammalia) from the early and middle Eocene of Pakistan and their paleobiogeographical implicationsContributions from the Museum of Paleontology, University of Michigan.  32:1-14. 2008
    2007 Ganungulatum xincunliense, an artiodactyl-like mammal (Ungulata, Mammalia) from the Paleocene, Chijiang Basin, Jiangxi, ChinaVertebrata PalAsiatica.  10:278-286. 2007
    2006 New primates (mammalia) from Gandhera Quarry, early Eocene, Balochistan Province, PakistanJournal of Vertebrate Paleontology.  26:71A-71A. 2006
    2006 Geochronology and mammalian biostratigraphy of middle and upper Paleocene continental strata, Bighorn Basin, WyomingAmerican Journal of Science.  306:211-245. 2006
    2005 Basal anthropoids from Egypt and the antiquity of Africa's higher primate radiation.Science The Scientific monthly.  310:300-304. 2005
    2005 Evaluating the relationship between pedofacies and faunal composition: Implications for faunal turnover at the Paleocene-Eocene boundaryPalaios.  20:390-399. 2005
    2004 NEW EARLY EOCENE MAMMALIAN FOSSILS FROM THE HENGYANG BASIN, HUNAN CHINABulletin of Carnegie Museum of Natural History.  36:291-301. 2004
    2004 Discussion and reply : Ar-40/Ar-19 geochronology of the Eocene Green River Formation, Wyoming DiscussionBulletin of the Geological Society of America.  116:251-252. 2004
    2004 Reassessing hominoid phylogeny: evaluating congruence in the morphological and temporal dataPaleobiology.  30:614-651. 2004
    2004 Wasatchian through Duchesnean biochronologyLate Cretaceous and Cenozoic mammals of North America: biostratigraphy and geochronology.  106-155. 2004
    2003 Stratigraphic response and mammalian dispersal during initial India-Asia collision: Evidence from the Ghazij Formation, Balochistan, PakistanGeology.  31:1097-1100. 2003
    2003 Carbon and oxygen isotope records from Paleosols spanning the Paleocene-Eocene boundary, Bighorn Basin, WyomingGeological Society of America Special Papers.  369:49-64. 2003
    2003 Testing the relationship between pedofacies and avulsion using Markov analysisAmerican Journal of Science.  303:60-71. 2003
    2002 Mammalian dispersal at the Paleocene/Eocene boundary.Science The Scientific monthly.  295:2062-2065. 2002
    2002 Comparing the gap excess ratio and the retention index of the stratigraphic character.Systematic Biology.  51:166-176. 2002
    2001 Linking the Wasatchian/Bridgerian boundary to the Cenozoic Global Climate Optimum: new magnetostratigraphic and isotopic results from South Pass, WyomingPalaeogeography, Palaeoclimatology, Palaeoecology.  167:175-199. 2001
    2001 Mammalian biostratigraphy of the McCullough Peaks area in the northern Bighorn BasinPaleocene-Eocene stratigraphy and biotic change in the Bighorn and Clarks Fork basins, Wyoming: University of Michigan Papers on Paleontology.  33:109-126. 2001
    2001 Overview of mammalian biostratigraphy in the Paleocene-Eocene Fort Union and Willwood formations of the Bighorn and Clarks Fork basinsUniversity of Michigan Papers on Paleontology.  33:1-14. 2001
    2000 Tectonic and biogeographic implications of the Ghazij Formation (lower Eocene), Baluchistan Province, PakistanGFF.  122:34-35. 2000
    1999 Machocyon abbasi, a new early Eocene Quettacyonid (Mammalia, Condylarthra) from the middle Ghazij Formation of Mach and Deghari Coal fields, Baluchistan (Pakistan)Contributions from the Museum of Paleontology, University of Michigan.  30:233-250. 1999
    1999 New Early Eocene Mammalian Fauna from the Upper Ghazij Formation of Baluchistan (Pakistan)Journal of Vertebrate Paleontology.  19:47A-47A. 1999
    1999 Playing Wegener in a mock world–a laboratory exercise for introductory Earth History classesJournal of Geoscience Education Journal of Geological Education.  47:336-340. 1999
    1999 Strange Old WorldPaleobiology.  25:417-423. 1999
    1998 Mammalian community response to the latest Paleocene thermal maximum: An isotaphonomic study in the northern Bighorn Basin, Wyoming (vol 26, pg 1011, 1998)Geology.  26:1152-1152. 1998
    1998 Mammalian community response to the latest Paleocene thermal maximum: An isotaphonomic study in the northern Bighorn Basin, WyomingGeology.  26:1011-1014. 1998
    1998 Evidence for rapid climate change in North America during the latest Paleocene thermal maximum: oxygen isotope compositions of biogenic phosphate from the Bighorn Basin (Wyoming)Earth and Planetary Science Letters.  160:193-208. 1998
    1998 Intra-tooth variations in delta O-18 (PO4) of mammalian tooth enamel as a record of seasonal variations in continental climate variablesGeochimica et Cosmochimica Acta.  62:1839-1850. 1998
    1998 Middle Eocene stratigraphy and marine mammals (Mammalia: Cetacea and Sirenia) of the Sulaiman Range, PakistanBull Carnegie Mus Nat Hist.  34:239-259. 1998
    1997 Magnetostratigraphy across the Wasatchian/Bridgerian NALMA boundary (early to middle Eocene) in the western Green River Basin, WyomingJournal of Geology.  105:657-669. 1997
    1997 Comparing the fit of stratigraphic and morphologic data in phylogenetic analysisPaleobiology.  23:1-19. 1997
    1997 Comparing the fit of stratigraphic and morphologic data in phylogenetic analysisPaleobiology.  23:1-19. 1997
    1995 CHRONOLOGY OF THE WASATCHIAN LAND-MAMMAL AGE (EARLY EOCENE) - MAGNETOSTRATIGRAPHIC RESULTS FROM THE MCCULLOUGH PEAKS SECTION, NORTHERN BIGHORN BASIN, WYOMING - A REPLYJournal of Geology.  103:464-466. 1995
    1995 New Archaeocetes (Mammalia, Cetacea) from the middle Eocene Domanda Formation of the Sulaiman Range, Punjab (Pakistan)ontributions from the Museum of Paleontology, University of Michigan.  29:291-330. 1995
    1994 CHRONOLOGY OF THE WASATCHIAN LAND-MAMMAL AGE (EARLY EOCENE) - MAGNETOSTRATIGRAPHIC RESULTS FROM THE MCCULLOUGH PEAKS SECTION, NORTHERN BIGHORN BASIN, WYOMINGJournal of Geology.  102:367-377. 1994
    1994 RATES OF EVOLUTION IN THE DENTITION OF EARLY EOCENE CANTIUS - COMPARISON OF SIZE AND SHAPEPaleobiology.  20:506-522. 1994

    Book

    Year Title
    2015 Ancient Wyoming A Dozen Lost Worlds Based on the Geology of the Bighorn Basin 2015

    Chapter

    Year Title
    2012 Terrestrial Ecosystem Response to Climate Change during the Paleogene.  157-157. 2012
    2008 Geology, paleoenvironment, and age of Birket Qarun locality 2 (BQ-2), Fayum Depression, Egypt.  71-+. 2008
    2003 Biostratigraphic, chemostratigraphic, and magnetostratigraphic study across the Paleocene/Eocene boundary in the Hengyang Basin, Hunan, China 2003
    2003 Stratal architecture of an Early Eocene fluvial-lacustrine depositional system, Little Muddy Creek area, southwestern Green River Basin, Wyoming. 2003
    2001 Gandhera quarry, a unique mammalian faunal assemblage from the early Eocene of Baluchistan (Pakistan).  251-262. 2001
    2000 Phenotypic response of foraminifera to episodes of global environmental change 2000

    Conference Proceeding

    Year Title
    2017 Boron in soil carbonates: development and initial application of a hybrid paleo-CO2 proxyGeological Society of America Abstracts with Programs. 2017
    2017 New perspectives on the correlation of South American Land Mammal Ages to early Paleogene climate changes based on recent chronostratigraphic results from the San Jorge Basin, ArgentinaClimatic and Biotic Events of the Paleogene, Program with Abstracts. 117-117. 2017
    2017 PETM stratigraphy of the Basin substation core, Climatic and Biotic Events of the PaleogeneClimatic and Biotic Events of the Paleogene, Program with Abstracts. 93-94. 2017
    2017 Reconstructing high resolution records of paleoclimate from magnetic mineral assemblages in modern soils and paleosols sequences: progress and challengesGeological Society of America Abstracts with Programs. 2017
    2017 Synchronizing early Eocene deep-sea and continental records – new cyclostratigraphic age models from the Bighorn Basin Coring Project, Climatic and Biotic Events of the PaleogeneClimatic and Biotic Events of the Paleogene, Program with Abstracts. 91-91. 2017
    2016 Bystander Intervention and Bias in the Academic Workplace: Data, Challenges, and Strategies 2016
    2012 BIOSTRATIGRAPHY AND CORRELATION OF VERTEBRATE AND PLANT FOSSILS FROM THE WIND RIVER FORMATION (YPRESIAN, EARLY TO MIDDLE EOCENE) OF CENTRAL WYOMING IN NORTH AMERICAJournal of Vertebrate Paleontology. 181-181. 2012
    2009 CHRONOSTRATIGRAPHIC CONSTRAINED ASIAN EARLY PALEOGENE STRATA AND MAMMALIAN FAUNAL TURNOVER EVENTSJournal of Vertebrate Paleontology. 191A-191A. 2009
    2008 ECOLOGICAL STABILITY AMONG EARLY EOCENE MAMMALIAN FAUNAS FROM THE BIGHORN BASIN, WYJournal of Vertebrate Paleontology. 154A-154A. 2008
    2007 Timing and correlation of the Shanghuan-Nongshanian Asian land mammal age boundaryJournal of Vertebrate Paleontology. 60A-60A. 2007
    2005 A NEW BASIN-WIDE MAGNETOSTRATIGRAPHIC FRAMEWORK FOR THE BIGHORN BASIN, WYOMINGJournal of Vertebrate Paleontology. 46A-47A. 2005
    2004 MAMMALIAN DISPERSAL AND THE INDIA-ASIA COLLISIONJournal of Vertebrate Paleontology. 47A-47A. 2004
    2003 THE 5% PROJECT: JUST HOW GOOD IS THE FOSSIL RECORD OF TETRAPODS?Journal of Vertebrate Paleontology. 29A-29A. 2003
    1995 NEW ARCHAEOCETE WHALES FROM THE EARLY MIDDLE EOCENE DOMANDA FORMATION OF PAKISTANJournal of Vertebrate Paleontology. 32A-32A. 1995
    1995 TIMING OF THE WASATCHIAN-BRIDGERIAN (EARLY-MIDDLE EOCENE) FAUNAL TRANSITION IN THE GREEN RIVER BASIN, WYOMINGJournal of Vertebrate Paleontology. 24A-24A. 1995

    Principal Investigator On

  • Collaborative Research: Assessing the Sensitivity of High-Altitude Environments to Globally Warm Climate as Recorded by Lacustrine Microbialite Carbonates  awarded by National Science Foundation (NSF) 2018 - 2021
  • Biotic and Climate Changes in North America During ETM2 and H2 Hyperthermal Events  awarded by National Geographic Society 2017 - 2018
  • Collaborative Research: From Dinosaurs to Primates: 100 Million Year Record of Tectonics and Vertebrate Evolution in the Western Branch of the East African Rift System  awarded by National Science Foundation (NSF) 2014 - 2017
  • Bighorn Basin Coring Project (BBCP) Targeted Continental Drilling of Paleogene Hyperthermals  awarded by National Science Foundation (NSF) 2010 - 2015
  • Upgrade of University of New Hampshire Paleomagnetism Laboratory  awarded by National Science Foundation (NSF) 2009 - 2012
  • High Resoltuion Calibration of the Maastrichtian to Paleocene of the Western US: Integration of Geochronology, Magnetostratigraphy and Paleontology  awarded by National Science Foundation (NSF) 2007 - 2010
  • The Bighorn Basin Coring project (BBCP)  awarded by National Science Foundation (NSF) 2007 - 2009
  • A Geochronological and Paleoenvironmental Framework for the Nanxiong Basin, Guangdong Provice, Sotuh China  awarded by National Science Foundation (NSF) 2006
  • Effects of Global Warming on Paleocene Eocene Ecosystems  awarded by National Science Foundation (NSF) 2000 - 2001
  • Acquisition of Paleomagnetic Equipment  awarded by National Science Foundation (NSF) 1999 - 2001
  • Geochronology & Mammalian Paleobiogeography  awarded by National Science Foundation (NSF) 1998 - 2001
  • Teaching Activities

  • Advanced Seminar/Earth Taught course 2018
  • Geological Field Methods Taught course 2018
  • Rsrch Exp/Earth Science Taught course 2018
  • Adv Rsrch Exp/Earth Sciences Taught course 2018
  • Paleontology Taught course 2018
  • Paleontology Taught course 2018
  • Rsrch Exp/Earth Sciences Taught course 2018
  • Top/Paleomagnetism Taught course 2018
  • Adv Rsrch Exp/Earth Science Taught course 2017
  • Geological Field Methods Taught course 2017
  • Adv Rsrch Exp/Earth Sciences Taught course 2017
  • Geotectonics Taught course 2017
  • Rsrch Exp/Earth Sciences Taught course 2017
  • Advanced Seminar/Earth Taught course 2016
  • Geological Field Methods Taught course 2016
  • Earth History Taught course 2016
  • Paleontology Taught course 2016
  • Paleontology Taught course 2016
  • Rsrch Exp/Earth Sciences Taught course 2016
  • Geological Field Methods Taught course 2015
  • Rsrch Exp/Earth Science Taught course 2015
  • Earth History Taught course 2015
  • Geotectonics Taught course 2015
  • Rsrch Exp/Earth Sciences Taught course 2015
  • Top/Rocky Mountain Field Trip Taught course 2015
  • Paleontology Taught course 2014
  • Paleontology Taught course 2014
  • Seminar in Earth Sciences Taught course 2014
  • Rsrch Exp/Natural Resources Taught course 2014
  • Sedimentology Taught course 2014
  • Sedimentology Taught course 2014
  • Education And Training

  • B.A. Geology/Earth Science, Princeton University
  • M.S. Geology/Earth Science, University of Michigan
  • Ph.D. Geology/Earth Science, University of Michigan
  • Full Name

  • William Clyde