Results 191 to 200 of about 5,084,494 (418)

Morphology and paleoecology of a hybodontiform with serrated teeth, Priohybodus arambourgi, from the Late Jurassic of northeastern Brazil

open access: yesThe Anatomical Record, EarlyView.
Abstract Hybodontiformes was a diverse, successful, and important group of shark‐like chondrichthyans known from a variety of ecosystems. Some representatives of the order had a wide palaeogeographic distribution, as is the case with Priohybodus arambourgi. With a multicuspidate crown, P. arambourgi was the first hybodontiform to develop fully serrated
Estevan Eltink   +5 more
wiley   +1 more source

Research on comprehensive assessment of coastal erosion intensity based on multi index method

open access: yesFrontiers in Marine Science
The intensity of coastal erosion is a measure of the strength of erosion processes affecting coastal areas. Traditionally, assessments of coastal erosion intensity have relied on singular indices, such as the rate of shoreline retreat or erosion, often ...
Guowei Fu   +7 more
doaj   +1 more source

Ground-Water Hydrology and Projected Effects of Ground-Water Withdrawals in the Sevier Desert, Utah [PDF]

open access: yes, 1983
The principal ground-water reservoir in the Sevier Desert is the unconsolidated basin fill. The fill has been divided generally into aquifers and confining beds, although there are no clearcut boundaries between these units--the primary aquifers are the
United States Geological Survey
core   +1 more source

Whole‐bone shape of hominoid manual proximal phalanges

open access: yesThe Anatomical Record, EarlyView.
Abstract Functional morphologists have long noted that skeletal adaptations in primate phalanges reflect locomotor behavior. While most studies have successfully used two‐dimensional measurements to quantify general features of phalanx shape, a whole‐bone three‐dimensional analysis may better capture more subtle aspects of phalanx morphology that have ...
Deanna M. Goldstein   +7 more
wiley   +1 more source

Silesaurid (Archosauria: Dinosauriformes) remains from the base of the Dockum Group (Late Triassic: Otischalkian) of Texas provide new insights to the North American record of dinosauriforms

open access: yesThe Anatomical Record, EarlyView.
Abstract Silesaurids (Archosauria: Dinosauriformes) are found in Middle to Upper Triassic deposits across Pangea, but few stratigraphic sections record the evolution of the group in one geographic area over millions of years. Here, we describe silesaurid remains from the oldest of the Upper Triassic stratigraphic sequence from the base of the Dockum ...
Frederick B. Tolchard   +2 more
wiley   +1 more source

SeafloorAI: A Large-scale Vision-Language Dataset for Seafloor Geological Survey [PDF]

open access: yesarXiv
A major obstacle to the advancements of machine learning models in marine science, particularly in sonar imagery analysis, is the scarcity of AI-ready datasets. While there have been efforts to make AI-ready sonar image dataset publicly available, they suffer from limitations in terms of environment setting and scale.
arxiv  

Preliminary Geologic Map of the Kanab 30 by 60 Minute Quadrangle, Utah-Arizona [PDF]

open access: yes, 1990
This map is preliminary and has not been reviewed for conformity with U.S.
United States Geological Survey
core   +1 more source

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