Robert Weems
Robert Weems is a Scientist Emeritus at the Florence Bascom Geoscience Center.
Science and Products
Filter Total Items: 37
Surficial geologic map of the Elizabethtown 30' x 60' quadrangle, North Carolina
The Elizabethtown 30' x 60' quadrangle is located in southeastern North Carolina between Fayetteville and Wilmington. Most of the area is flat to gently rolling, although steep slopes occur locally along some of the larger streams. Total relief in the area is slightly over 210 feet (ft), with elevations ranging from slightly less than 10 ft above sea level along the Black River (east of Rowan in t
Authors
Robert E. Weems, William C. Lewis, E. Allen Crider
Detailed sections from auger holes in the Elizabethtown 1:100,000-scale quadrangle, North Carolina
The Elizabethtown 1:100,000 quadrangle is in the west-central part of the Coastal Plain of southeastern North Carolina. The Coastal Plain, in this region, consists mostly of unlithified sediments that range in age from Late Cretaceous to Holocene. These sediments lie with profound unconformity on complexly deformed metamorphic and igneous rocks similar to rocks found immediately to the west in the
Authors
Robert E. Weems, William C. Lewis, Joseph H. Murray, David B. Queen, Jeffrey B. Grey, Benjamin D. DeJong
An occurrence of the protocetid whale "Eocetus" wardii in the middle Eocene Piney Point Formation of Virginia
Two protocetid whale vertebrae, here referred to “Eocetus” wardii, have been recovered from the riverbed of the Pamunkey River in east-central Virginia. Neither bone was found in situ, but both were found with lumps of lithified matrix cemented to their surfaces. Most of this matrix was removed and processed for microfossils. Specimens of dinoflagellates were successfully recovered and this flora
Authors
Robert E. Weems, Lucy E. Edwards, Jason E. Osborne, A.A. Alford
Position of the Triassic-Jurassic boundary and timing of the end-Triassic extinctions on land: Data from the Moenave Formation on the southern Colorado Plateau, USA
Strata of the Moenave Formation on and adjacent to the southern Colorado Plateau in Utah–Arizona, U.S.A., represent one of the best known and most stratigraphically continuous, complete and fossiliferous terrestrial sections across the Triassic–Jurassic boundary. We present a synthesis of new biostratigraphic and magnetostratigraphic data collected from across the Moenave Formation outcrop belt, w
Authors
S. G. Lucas, L.H. Tanner, L. Donohoo-Hurley, J. W. Geissman, H. W. Kozur, A.B. Heckert, Robert E. Weems
Detailed Sections from Auger Holes in the Emporia 1:100,000-Scale Quadrangle, North Carolina and Virginia
The Emporia 1:100,000-scale quadrangle straddles the Tidewater Fall Line in southern Virginia and includes a small part of northernmost North Carolina. Sediments of the coastal plain underlie the eastern three-fifths of this area. These sediments onlap crystalline basement rocks toward the west and dip gently to the east, reaching a maximum known thickness of 821 feet in the extreme southeastern p
Authors
Robert E. Weems, J. Stephen Schindler, William C. Lewis
The biostratigraphic importance of conchostracans in the continental Triassic of the northern hemisphere
Conchostracans or clam shrimp (order Conchostraca Sars) are arthropods with a carapace consisting of two chitinous lateral valves. Triassic conchostracans range in size from 2 to 12.5 mm long and are common in deposits that formed in fresh water lakes, isolated ponds and brackish areas. Their dessication- and freeze-resistant eggs can be dispersed by wind over long distances. Therefore many concho
Authors
H. W. Kozur, Robert E. Weems
Preliminary Physical Stratigraphy and Geophysical Data From the USGS Dixon Core, Onslow County, North Carolina
In October through November 2006, scientists from the U. S. Geological Survey (USGS) Eastern Region Earth Surface Processes Team (EESPT) and the Raleigh (N.C.) Water Science Center (WSC), in cooperation with the North Carolina Geological Survey (NCGS) and the Onslow County Water and Sewer Authority (ONWASA), drilled a stratigraphic test hole and well in Onslow County, N.C. The Dixon corehole was c
Authors
Ellen Seefelt, Wilma Aleman B. Gonzalez, Jean M. Self-Trail, Robert E. Weems, Lucy E. Edwards, Herbert A. Pierce, Colleen T. Durand
Surficial geologic map of the Roanoke Rapids 30' x 60' quadrangle, North Carolina
The Roanoke Rapids 1:100,000 map sheet is located in northeastern North Carolina. Most of the area is flat to gently rolling, though steep slopes occur occasionally along some of the larger streams. Total relief in the area is slightly less than 400 feet (ft), with elevations ranging from sea level east of Murfreesboro in the far northeastern corner of the map to 384 ft near the northwestern map b
Authors
Robert E. Weems, William C. Lewis, Wilma Aleman-Gonzalez
Preliminary physical stratigraphy and geophysical data of the USGS Hope Plantation core (BE-110), Bertie County, North Carolina
In March and April, 2004, the U.S. Geological Survey (USGS), in cooperation with the North Carolina Geological Survey (NCGS) and the Raleigh Water Resources Discipline (WRD), drilled a stratigraphic test hole and well in Bertie County, North Carolina (fig. 1). The Hope Plantation test hole (BE-110-2004) was cored on the property of Hope Plantation near Windsor, North Carolina. The drill site is lo
Authors
Robert E. Weems, Ellen Seefelt, Beth M. Wrege, Jean M. Self-Trail, David C. Prowell, Colleen Durand, Eugene F. Cobbs, Kevin C. McKinney
Detailed Sections from Auger Holes in the Roanoke Rapids 1:100,000 Map Sheet, North Carolina
Introduction
The Roanoke Rapids 1:100,000 map sheet straddles the Coastal Plain / Piedmont boundary in northernmost North Carolina (Figure 1). Sediments of the Coastal Plain underlie the eastern three-fourths of this area, and patchy outliers of Coastal Plain units cap many of the higher hills in the western one-fourth of the area. Sediments dip gently to the east and reach a maximum known thic
Authors
Robert E. Weems, William C. Lewis
Evidence for prosauropod dinosaur gastroliths in the Bull Run Formation (Upper Triassic, Norian) of Virginia
Definitive criteria for distinguishing gastroliths from sedimentary clasts are lacking for many depositional settings, and many reported occurrences of gastroliths either cannot be verified or have been refuted. We discuss four occurrences of gastrolith-like stones (category 6 exoliths) not found within skeletal remains from the Upper Triassic Bull Run Formation of northern Virginia, USA. Despite
Authors
Robert E. Weems, Michelle J. Culp, Oliver Wings
Diverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland
Until recently fossil footprints were virtually unknown from the Cretaceous of the eastern United States. The discovery of about 300 footprints in iron-rich siliciclastic facies of the Patuxent Formation (Potomac Group) of Aptian age is undoubtedly one of the most significant Early Cretaceous track discoveries since the Paluxy track discoveries in Texas in the 1930s. The Patuxent tracks include th
Authors
Ray Stanford, Martin G. Lockley, Robert E. Weems
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Surficial geologic map of the Elizabethtown 30' x 60' quadrangle, North Carolina
The Elizabethtown 30' x 60' quadrangle is located in southeastern North Carolina between Fayetteville and Wilmington. Most of the area is flat to gently rolling, although steep slopes occur locally along some of the larger streams. Total relief in the area is slightly over 210 feet (ft), with elevations ranging from slightly less than 10 ft above sea level along the Black River (east of Rowan in tAuthorsRobert E. Weems, William C. Lewis, E. Allen CriderDetailed sections from auger holes in the Elizabethtown 1:100,000-scale quadrangle, North Carolina
The Elizabethtown 1:100,000 quadrangle is in the west-central part of the Coastal Plain of southeastern North Carolina. The Coastal Plain, in this region, consists mostly of unlithified sediments that range in age from Late Cretaceous to Holocene. These sediments lie with profound unconformity on complexly deformed metamorphic and igneous rocks similar to rocks found immediately to the west in theAuthorsRobert E. Weems, William C. Lewis, Joseph H. Murray, David B. Queen, Jeffrey B. Grey, Benjamin D. DeJongAn occurrence of the protocetid whale "Eocetus" wardii in the middle Eocene Piney Point Formation of Virginia
Two protocetid whale vertebrae, here referred to “Eocetus” wardii, have been recovered from the riverbed of the Pamunkey River in east-central Virginia. Neither bone was found in situ, but both were found with lumps of lithified matrix cemented to their surfaces. Most of this matrix was removed and processed for microfossils. Specimens of dinoflagellates were successfully recovered and this floraAuthorsRobert E. Weems, Lucy E. Edwards, Jason E. Osborne, A.A. AlfordPosition of the Triassic-Jurassic boundary and timing of the end-Triassic extinctions on land: Data from the Moenave Formation on the southern Colorado Plateau, USA
Strata of the Moenave Formation on and adjacent to the southern Colorado Plateau in Utah–Arizona, U.S.A., represent one of the best known and most stratigraphically continuous, complete and fossiliferous terrestrial sections across the Triassic–Jurassic boundary. We present a synthesis of new biostratigraphic and magnetostratigraphic data collected from across the Moenave Formation outcrop belt, wAuthorsS. G. Lucas, L.H. Tanner, L. Donohoo-Hurley, J. W. Geissman, H. W. Kozur, A.B. Heckert, Robert E. WeemsDetailed Sections from Auger Holes in the Emporia 1:100,000-Scale Quadrangle, North Carolina and Virginia
The Emporia 1:100,000-scale quadrangle straddles the Tidewater Fall Line in southern Virginia and includes a small part of northernmost North Carolina. Sediments of the coastal plain underlie the eastern three-fifths of this area. These sediments onlap crystalline basement rocks toward the west and dip gently to the east, reaching a maximum known thickness of 821 feet in the extreme southeastern pAuthorsRobert E. Weems, J. Stephen Schindler, William C. LewisThe biostratigraphic importance of conchostracans in the continental Triassic of the northern hemisphere
Conchostracans or clam shrimp (order Conchostraca Sars) are arthropods with a carapace consisting of two chitinous lateral valves. Triassic conchostracans range in size from 2 to 12.5 mm long and are common in deposits that formed in fresh water lakes, isolated ponds and brackish areas. Their dessication- and freeze-resistant eggs can be dispersed by wind over long distances. Therefore many conchoAuthorsH. W. Kozur, Robert E. WeemsPreliminary Physical Stratigraphy and Geophysical Data From the USGS Dixon Core, Onslow County, North Carolina
In October through November 2006, scientists from the U. S. Geological Survey (USGS) Eastern Region Earth Surface Processes Team (EESPT) and the Raleigh (N.C.) Water Science Center (WSC), in cooperation with the North Carolina Geological Survey (NCGS) and the Onslow County Water and Sewer Authority (ONWASA), drilled a stratigraphic test hole and well in Onslow County, N.C. The Dixon corehole was cAuthorsEllen Seefelt, Wilma Aleman B. Gonzalez, Jean M. Self-Trail, Robert E. Weems, Lucy E. Edwards, Herbert A. Pierce, Colleen T. DurandSurficial geologic map of the Roanoke Rapids 30' x 60' quadrangle, North Carolina
The Roanoke Rapids 1:100,000 map sheet is located in northeastern North Carolina. Most of the area is flat to gently rolling, though steep slopes occur occasionally along some of the larger streams. Total relief in the area is slightly less than 400 feet (ft), with elevations ranging from sea level east of Murfreesboro in the far northeastern corner of the map to 384 ft near the northwestern map bAuthorsRobert E. Weems, William C. Lewis, Wilma Aleman-GonzalezPreliminary physical stratigraphy and geophysical data of the USGS Hope Plantation core (BE-110), Bertie County, North Carolina
In March and April, 2004, the U.S. Geological Survey (USGS), in cooperation with the North Carolina Geological Survey (NCGS) and the Raleigh Water Resources Discipline (WRD), drilled a stratigraphic test hole and well in Bertie County, North Carolina (fig. 1). The Hope Plantation test hole (BE-110-2004) was cored on the property of Hope Plantation near Windsor, North Carolina. The drill site is loAuthorsRobert E. Weems, Ellen Seefelt, Beth M. Wrege, Jean M. Self-Trail, David C. Prowell, Colleen Durand, Eugene F. Cobbs, Kevin C. McKinneyDetailed Sections from Auger Holes in the Roanoke Rapids 1:100,000 Map Sheet, North Carolina
Introduction The Roanoke Rapids 1:100,000 map sheet straddles the Coastal Plain / Piedmont boundary in northernmost North Carolina (Figure 1). Sediments of the Coastal Plain underlie the eastern three-fourths of this area, and patchy outliers of Coastal Plain units cap many of the higher hills in the western one-fourth of the area. Sediments dip gently to the east and reach a maximum known thicAuthorsRobert E. Weems, William C. LewisEvidence for prosauropod dinosaur gastroliths in the Bull Run Formation (Upper Triassic, Norian) of Virginia
Definitive criteria for distinguishing gastroliths from sedimentary clasts are lacking for many depositional settings, and many reported occurrences of gastroliths either cannot be verified or have been refuted. We discuss four occurrences of gastrolith-like stones (category 6 exoliths) not found within skeletal remains from the Upper Triassic Bull Run Formation of northern Virginia, USA. DespiteAuthorsRobert E. Weems, Michelle J. Culp, Oliver WingsDiverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland
Until recently fossil footprints were virtually unknown from the Cretaceous of the eastern United States. The discovery of about 300 footprints in iron-rich siliciclastic facies of the Patuxent Formation (Potomac Group) of Aptian age is undoubtedly one of the most significant Early Cretaceous track discoveries since the Paluxy track discoveries in Texas in the 1930s. The Patuxent tracks include thAuthorsRay Stanford, Martin G. Lockley, Robert E. Weems