Androdecidua endressii gen. et sp. nov., from the Late Cretaceous of Georgia (United States): Further Floral Diversity in Hamamelidoideae (Hamamelidaceae)

2001 ◽  
Vol 162 (4) ◽  
pp. 963-983 ◽  
Author(s):  
Susana Magallón ◽  
Patrick S. Herendeen ◽  
Peter R. Crane
Keyword(s):  
United States ◽  
Late Cretaceous ◽  
Floral Diversity

Description of new dyrosaurid specimens from the Late Cretaceous–Early Paleogene of New Jersey, United States, and comments on Hyposaurus systematics

2019 ◽  
Vol 32 (10) ◽  
pp. 1377-1393
Author(s):  
Rafael Gomes de Souza ◽  
Beatriz Marinho Hörmanseder ◽  
Rodrigo Giesta Figueiredo ◽  
Diogenes de Almeida Campos
Keyword(s):  
United States ◽  
New Jersey ◽  
Late Cretaceous ◽  
Early Paleogene

Middle Cenomanian (Late Cretaceous) molluscs of the Shaftesbury Formation, Birch Mountains, northeastern Alberta, Canada

2015 ◽  
Vol 52 (8) ◽  
pp. 542-556 ◽  
Author(s):  
Lisa L. Bohach ◽  
Emily K. Frampton
Keyword(s):  
United States ◽  
Late Cretaceous ◽  
The United States ◽  
Fish Scales ◽  
Invertebrate Fauna ◽  
Frontier Formation ◽  
Fort Mcmurray ◽  
Historical Resources ◽  
Invertebrate Fossils ◽  
Northeastern Alberta

Historical Resources Impact Assessment and Mitigation studies have documented a new middle Cenomanian invertebrate fauna from the Shaftesbury Formation in the Birch Mountains, northwest of Fort McMurray, in northeastern Alberta, Canada. Although older portions (Albian) of the Shaftesbury Formation in Alberta and British Columbia have yielded invertebrate fossils, this is the first fauna of middle Cenomanian age known for the unit. The fauna includes the ammonites Acanthoceras wyomingense and Borissjakoceras orbiculatum, the inoceramid bivalves Inoceramus dunveganensis and Inoceramus prefragilis stephensoni, and the gastropod Pirsila tensa. The occurrence of the late middle Cenomanian zonal fossil A. wyomingense allows correlation between the middle “Fish Scales Formation” of the Shaftesbury Formation and the lower part of the Labiche Formation of Alberta, and with five units farther to the south in the United States, namely the Greenhorn Limestone, Lincoln Formation, and Graneros Shale of Kansas, the Frontier Formation of Wyoming, and the Belle Fourche Shale of Montana.

scholarly journals Evolution of the Late Cretaceous Nanaimo Basin, British Columbia, Canada: Definitive provenance links to northern latitudes

Geosphere ◽  
2021 ◽  
Author(s):  
J. Brian Mahoney ◽  
James W. Haggart ◽  
Marty Grove ◽  
David L. Kimbrough ◽  
Virginia Isava ◽  
...  
Keyword(s):  
United States ◽  
British Columbia ◽  
Late Cretaceous ◽  
Detrital Zircon ◽  
Tectonic Evolution ◽  
Sediment Supply ◽  
Local Source ◽  
Southern Coast ◽  
Coast Mountains ◽  
Belt Supergroup

Accurate reconstruction of the Late Cretaceous paleogeography and tectonic evolution of the west- ern North American Cordilleran margin is required to resolve the long-standing debate over proposed large-scale, orogen-parallel terrane translation. The Nanaimo Basin (British Columbia, Canada) contains a high-fidelity record of orogenic exhumation and basin subsidence in the southwestern Canadian Cordillera that constrains the tectonic evolution of the region. Integration of detrital zircon U-Pb geochronology, conglomerate clast U-Pb geochronology, detrital muscovite 40Ar/39Ar thermochronology, and Lu-Hf isotopic analysis of detrital zircon defines a multidisciplinary provenance signature that provides a definitive linkage with sediment source regions north of the Sierra Nevada arc system (western United States). Analysis of spatial and temporal provenance variations within Nanaimo Group strata documents a bimodal sediment supply with a local source derived from the adjacent magmatic arc in the southern Coast Mountains batholith and an extra-regional source from the Mesoproterozoic Belt Supergroup and the Late Cretaceous Atlanta lobe of the Idaho batholith. Particularly robust linkages include: (1) juvenile (εHf >+10) Late Cretaceous zircon derived from the southern Coast Mountains batholith; (2) a bimodal Proterozoic detrital zircon signature consistent with derivation from Belt Supergroup (1700–1720 Ma) and ca. 1380 Ma plutonic rocks intruding the Lemhi subbasin of central Idaho (northwestern United States); (3) quartzite clasts that are statistical matches for Mesoproterozoic and Cambrian strata in Montana and Idaho (northwestern United States) and southern British Columbia; and (4) syndepositional evolved (εHf >−10) Late Cretaceous zircon and muscovite derived from the Atlanta lobe of the Idaho batholith. These provenance constraints support a tectonic restoration of the Nanaimo Basin, the southern Coast Mountains batholith, and Wrangellia to a position outboard of the Idaho batholith in Late Cretaceous time, consistent with proposed minimal-fault-offset models (<~1000 km).

scholarly journals Supplemental Material: Constraining the effects of dynamic topography on the development of Late Cretaceous Cordilleran foreland basin, western United States

2021 ◽  
Author(s):  
Zhiyang Li ◽  
Jennifer Aschoff
Keyword(s):  
United States ◽  
Late Cretaceous ◽  
Foreland Basin ◽  
Well Logs ◽  
Western United States ◽  
Dynamic Topography ◽  
Cordilleran Foreland

Table S1 includes sources for the chronostratigraphic framework in Figure 3 and Table S2 includes information of well logs shown in Figure 4.

Giant fossil coelacanths of the Late Cretaceous in the eastern United States

Geology ◽  
1994 ◽  
Vol 22 (6) ◽  
pp. 503 ◽  
Author(s):  
David R. Schwimmer ◽  
J. D. Stewart ◽  
G. Dent Williams
Keyword(s):  
United States ◽  
Late Cretaceous ◽  
Eastern United States

A survey of the Cretaceous ammonite Placenticeras Meek, 1876, in the United States Western Interior, with notes on the earliest species from Texas

2016 ◽  
Vol 66 (4) ◽  
pp. 587-608
Author(s):  
W.J. Kennedy
Keyword(s):  
United States ◽  
South Dakota ◽  
Late Cretaceous ◽  
The United States ◽  
Geological Survey ◽  
Additional Information ◽  
Space And Time ◽  
Original Manuscript

Abstract This contribution documents the record of the late Cretaceous ammonite Placenticeras Meek, 1876, from the late Cenomanian of Texas and the southern part of the U. S. Western Interior up to the late Middle Campanian zone of Baculites scotti, reconstructed and updated from an incomplete manuscript by the late W. A. Cobban based on the collections of the U. S. Geological Survey. The original manuscript dates from the late 1980’s, and there is now additional information on the occurrence of the genus that is incorporate here; much of this comes from Neal Larson of Hill City, South Dakota, to whom I am indebted for his help in preparing Bill’s manuscript for publication. It now provides an objective documentation of the distribution of Placenticeras in space and time on which any subsequent analysis of the evolution of the genus will depend.

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