Robert E. Weems
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View article: Late Miocene turtles from Southern Costa Rica
Late Miocene turtles from Southern Costa Rica Open
Recent vertebrate fossil collections in southern Costa Rica have uncovered fragmentary remains of five fossil turtle taxa. These remains were recovered from deltaic sedimentary deposits of the Upper Miocene San Gerardo unit, which unconfor…
View article: Doing Business in Plains Sight: Researching Comparative Entrepreneurship in Wichita, Kansas
Doing Business in Plains Sight: Researching Comparative Entrepreneurship in Wichita, Kansas Open
Cities in the nation’s middle section are defined by concepts of boosterism, tourism, and growth. Consequently, cities throughout the region have been shaped by an ongoing tradition of entrepreneurship and business acumen. Moreover, in thi…
View article: PTEROSAUR TRACKS FROM THE LOWER CRETACEOUS PATUXENT FORMATION OF VIRGINIA
PTEROSAUR TRACKS FROM THE LOWER CRETACEOUS PATUXENT FORMATION OF VIRGINIA Open
Blocks of Patuxent Sandstone, used as cornerstones in Gunston Hall in Fairfax County, Virginia, contain occasional footprints of Lower Cretaceous vertebrate animals. Among these are footprints of a large pterosaur, which is the first repor…
View article: CETACEAN REMAINS FROM THE LOWER OLIGOCENE OLD CHURCH FORMATION OF VIRGINIA
CETACEAN REMAINS FROM THE LOWER OLIGOCENE OLD CHURCH FORMATION OF VIRGINIA Open
Remains of six types of Oligocene cetaceans have been recovered from the outcrop region of the Old Church Formation in the Atlantic Coastal Plain of east-central Virginia. These remains provide the first glimpse of the cetacean fauna that …
View article: AN EARLY SILURIAN FISH FROM THE CLINCH (TUSCARORA) SANDSTONE OF VIRGINIA
AN EARLY SILURIAN FISH FROM THE CLINCH (TUSCARORA) SANDSTONE OF VIRGINIA Open
A fossil fish bone is reported from the Early Silurian Clinch (Tuscarora) Sandstone of Lee County, southwestern Virginia. This Silurian fish specimen constitutes the oldest occurrence of fossil fish yet found in eastern North America, whic…
View article: Geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina
Geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina Open
First posted March 18, 2022 For additional information, contact: Florence Bascom Geoscience CenterU.S. Geological SurveyMail Stop 926A12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse This 1:100,000-scale geologic map of the…
View article: Preliminary geologic map of the Cherry Hill quadrangle, Dinwiddie, Sussex, and Greensville Counties, Virginia
Preliminary geologic map of the Cherry Hill quadrangle, Dinwiddie, Sussex, and Greensville Counties, Virginia Open
First posted March 10, 2022 For additional information, contact: Director, Florence Bascom Geoscience CenterU.S. Geological Survey12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse The Cherry Hill 7.5-minute quadrangle stradd…
View article: Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna
Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna Open
Study of vertebrate fossils from the South Carolina Coastal Plain played a significant role in the early history of vertebrate paleontology as a scientific discipline in North America. However, a clear understanding of the state’s vertebra…
View article: Cross section of the North Carolina coastal plain from Enfield through Cape Hatteras
Cross section of the North Carolina coastal plain from Enfield through Cape Hatteras Open
First posted January 6, 2020 For additional information, contact: Florence Bascom Geoscience CenterU.S. Geological Survey926A National Center12201 Sunrise Valley DriveReston, VA 20192 The Atlantic Coastal Plain, the southeasternmost physio…
View article: Detailed Lithologic Logs from Auger Holes in southern Charleston County, southwestern Dorchester County, and eastern Colleton County, South Carolina
Detailed Lithologic Logs from Auger Holes in southern Charleston County, southwestern Dorchester County, and eastern Colleton County, South Carolina Open
First posted November 7, 2019 For additional information, contact: Director, Florence Bascom Geoscience CenterU.S. Geological SurveyMS 926A National Center12201 Sunrise Valley DriveReston, VA 20192 The lithologic logs described in this ope…
View article: The transition between<i>Carcharocles chubutensis</i>and<i>Carcharocles megalodon</i>(Otodontidae, Chondrichthyes): lateral cusplet loss through time
The transition between<i>Carcharocles chubutensis</i>and<i>Carcharocles megalodon</i>(Otodontidae, Chondrichthyes): lateral cusplet loss through time Open
The teeth of two megatooth macro-predatory shark species (Carcharocles chubutensis and Carcharocles megalodon; Otodontidae, Chondrichthyes) occur within the Miocene Chesapeake Group of Maryland, U.S.A. Definitive separation between all the…
View article: More-complete remains of<i>Procolpochelys charlestonensis</i>(Oligocene, South Carolina), an occurrence of<i>Euclastes</i>(upper Eocene, South Carolina), and their bearing on Cenozoic pancheloniid sea turtle distribution and phylogeny
More-complete remains of<i>Procolpochelys charlestonensis</i>(Oligocene, South Carolina), an occurrence of<i>Euclastes</i>(upper Eocene, South Carolina), and their bearing on Cenozoic pancheloniid sea turtle distribution and phylogeny Open
New and more-complete material of Procolpochelys charlestonensis Weems and Sanders, 2014 provides the first detailed information on the skull, jaw, and plastron of this species, which occurs in the Oligocene Ashley and Chandler Bridge form…
View article: Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds
Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds Open
How extinct, non-avian theropod dinosaurs locomoted is a subject of considerable interest, as is the manner in which it evolved on the line leading to birds. Fossil footprints provide the most direct evidence for answering these questions.…
View article: Geologic map of the Washington West 30’ × 60’ quadrangle, Maryland, Virginia, and Washington D.C.
Geologic map of the Washington West 30’ × 60’ quadrangle, Maryland, Virginia, and Washington D.C. Open
First posted January 2, 2018 For additional information, contact: Eastern Geology and Paleoclimate Science Center U.S. Geological Survey 12201 Sunrise Valley Drive 926A National Center Reston, VA 20192 The Washington West 30' × 60' quadran…
View article: Supplementary material from "Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds"
Supplementary material from "Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds" Open
How extinct, non-avian theropod dinosaurs locomoted is a subject of considerable interest, as is the manner in which it evolved on the line leading to birds. Fossil footprints provide the most direct evidence for answering these questions.…
View article: Digital geologic map data for the Ozark National Scenic Riverways and adjacent areas along the Current River and Jacks Fork, Missouri
Digital geologic map data for the Ozark National Scenic Riverways and adjacent areas along the Current River and Jacks Fork, Missouri Open
First posted September 23, 2016 For additional information, contact: Eastern Geology and Paleoclimate Science Center U.S. Geological Survey 926A National Center 12201 Sunrise Valley Drive Reston, VA 20192 http://geology.er.usgs.gov/egpsc/ …