Results 91 to 100 of about 402,108 (304)

Recent Geologic History of Mud-dominated Sediments in Hillsborough Bay, Florida - Phase I Report [PDF]

, 1989
The primary objective of this project, one phase of a potentially larger investigation on sediments of Hillsborough Bay, was to determine vertical distribution patterns of mud-dominated sediments.
Brooks, Gregg R., Doyle, Larry J.
core  

Burial and reactivity of sedimentary microalgal lipids in bioturbated Mediterranean coastal sediments [PDF]

, 2003
The fate of microalgal lipid biomarkers in marine coastal sediments when acted on by natural bioturbation processes (Carteau Bay, Gulf of Fos, Mediterranean Sea) was studied under laboratory conditions.
Caradec, Sarah, Gilbert, Franck, Grossi, Vincent   +2 more
core   +1 more source

New fossil unveils the dentary anatomy of the rare lepidosauromorph Cargninia enigmatica from the Upper Triassic of Southern Brazil

The Anatomical Record, EarlyView.
Abstract Nowadays, Lepidosauria is a diverse group represented by squamates and the rhynchocephalian tuatara. However, their origins date back to the end of the Permian Period, when the stem lineages Lepidosauromorpha and Archosauromorpha diverged. Within the lepidosauromorph stem lineage, a few species have been described with unstable phylogenetic ...
Lísie Vitória Soares Damke, Vitória Zanchett Dalle‐Laste, Leonardo Kerber, Lúcio Roberto‐da‐Silva, Rodrigo Temp Müller   +4 more
wiley   +1 more source

Discovery of giant and conventional magnetofossils bookending Cretaceous Oceanic Anoxic Event 2

Communications Earth & Environment
Conventional magnetofossils are the remains of magnetotactic bacteria and giant magnetofossils are the remains of iron biomineralizing organisms that have not yet been identified. We report the oldest robust conventional and giant magnetofossil records, ~
Courtney L. Wagner, Ioan Lascu, Jean M. Self-Trail, Tim Gooding, Kenneth J. T. Livi, Gianna Greger, Kristina Gardner, Jody Wycech, Mark Dreier, Tom Oliver   +9 more
doaj   +1 more source

Exceptional preservation informs the paleobiology of tapinocephalid dinocephalians

The Anatomical Record, EarlyView.
Abstract The tapinocephalid dinocephalian Moschops is one of the most iconic taxa of the middle Permian, yet its paleobiology remains one of the least well‐known. Here, we address some aspects of paleoneurology and paleobiology of Moschops using CT scanning of four well preserved skulls from the upper Abrahamskraal Formation of South Africa. Two of the
Julien Benoit, Lars Schmitz, Kenneth D. Angielczyk, Luke A. Norton, Andrew D. Bolton, Adam Midzuk, Roger M. H. Smith   +6 more
wiley   +1 more source

Evaluating the influence of lake morphology, trophic status and diagenesis on geochemical profiles in lake sediments [PDF]

, 2010
Recent geochemical studies provide evidence that changes in vertical distributions of nutrients in lake sediments are driven by anthropogenic activities, based primarily on trends of increasing concentrations in upper sediment layers.
Pilditch, Conrad A., Trolle, Dennis, Hamilton, David P.   +2 more
core   +1 more source

A new occurrence of tetrapod footprints from the Late Triassic of the Candelária Sequence, Brazil

The Anatomical Record, EarlyView.
Abstract The Hyperodapedon Assemblage Zone of the Candelária Sequence (Santa Maria Supersequence, Paraná Basin) preserves one of the most significant Late Triassic continental vertebrate assemblages in southern Brazil. Despite the relatively well‐documented body fossil record from this interval, ichnological records remain comparatively scarce.
Murilo Andrade‐Silva, Heitor Francischini   +1 more
wiley   +1 more source

Tooth histotype and enameloid microstructure of Priohybodus arambourgi d'Erasmo, 1960 (Elasmobranchii: Hybodontiformes) from the Late Jurassic of northeastern Brazil

The Anatomical Record, EarlyView.
Abstract Sharks possess varied diets and different prey capture mechanisms. As a result, the group exhibits a significant diversity in dental morphology, also reflecting the internal structures of the teeth. Internal dental anatomy points to the existence of three histotypes in elasmobranch phylogeny: orthodont, osteodont, and pseudoosteodont ...
Kelly Roberta da Silva, Valéria Gallo, Estevan Eltink   +2 more
wiley   +1 more source

Regional geochemical baseline concentration of potentially toxic trace metals in the mineralized Lom Basin, East Cameroon: a tool for contamination assessment

Geochemical Transactions, 2018
The distribution of trace metals in active stream sediments from the mineralized Lom Basin has been evaluated. Fifty-five bottom sediments were collected and the mineralogical composition of six pulverized samples determined by XRD. The fine fraction (
Mumbfu Ernestine Mimba, Takeshi Ohba, Salomon César Nguemhe Fils, Melvin Tamnta Nforba, Nozomi Numanami, Tasin Godlove Bafon, Festus Tongwa Aka, Cheo Emmanuel Suh   +7 more
doaj   +1 more source

Minnesota at a Glance Geologic Time

, 2017
Short summary of geologic time and age dating of rocks in Minnesota, issued in 1997, revised 2017.Minnesota is host to some of the oldest rocks on Earth; parts of the Morton gneiss in western Minnesota have been dated at 3.5 billion years old.
Southwick, D.L., Lusardi, B.A., Dengler, E.L.   +2 more
core