Results 81 to 90 of about 42,398 (325)

Osteohistological characterization of notosuchian osteoderms: Evidence for an overlying thick leathery layer of skin

Journal of Morphology, Volume 284, Issue 1, January 2023., 2023
The perpendicular insertion of Sharpey's fibers in the external cortex suggests the presence of a thick leathery skin layer overlying notosuchian osteoderms. Although intramembranous ossification is the main process involved in the development of crocodyliform osteoderms, we reported a case of metaplastic development.
Mariana Valéria de Araújo Sena, Thiago da Silva Marinho, Felipe Chinaglia Montefeltro, Max Cardoso Langer, Thiago Schineider Fachini, William Roberto Nava, André Eduardo Piacentini Pinheiro, Esaú Victor de Araújo, Paul Aubier, Rafael César Lima Pedroso de Andrade, Juliana Manso Sayão, Gustavo Ribeiro de Oliveira, Jorge Cubo   +12 more
wiley   +1 more source

Updating a simple model of lunar recession [PDF]

Applied Mathematical Sciences, Vol. 11, no. 58, 2877 - 2905 (2017), 2018
A classical model of lunar recession is reviewed and updated, where input parameters are taken or inferred from earlier astronomical computation of insolation quantities on Earth back to 0.25 Gyr. Free parameters are (i) the transition age, where mean lunar recession is suddenly lowered, and (ii) the merging age, where Earth-Moon distance (EMD), drops ...
arxiv  

Amateur paleontological societies and fossil clubs, interactions with professional paleontologists, and social paleontology in the United States

, 2016
Considerable interest exists among lifelong learners in the USA about fossils and the science of paleontology. Unlike some other science-related groups, e.g., astronomy and ornithology, interest in fossils among amateur paleontologists is primarily ...
B. MacFadden, L. Lundgren, Kent J. Crippen, B. A. Dunckel, Shari Ellis   +4 more
semanticscholar   +1 more source

Organogenesis in deep time: A problem in genomics, development, and paleontology

Proceedings of the National Academy of Sciences of the United States of America, 2015
Significance Phylogenetic data inclusive of rich paleontological records can be used to inform hypotheses on evolutionary transformations. These data, when combined with developmental studies and functional genomic assays in model and nonmodel organisms,
Joyce Pieretti, Andrew R. Gehrke, Igor Schneider, N. Adachi, Tetsuya Nakamura, N. Shubin   +5 more
semanticscholar   +1 more source

Coherent changes in wood charcoals, site occupation and lithic technology across the MIS 4/3 transition at Klein Kliphuis rock shelter, South Africa

Journal of Quaternary Science, Volume 38, Issue 1, Page 38-48, January 2023., 2023
Abstract We explore the correspondence between changing palaeoenvironments, patterns of site use, and lithic technology at the rock shelter site Klein Kliphuis (South Africa) across the interval 65–55 000 years before present. This period coincides with the termination of Marine Isotope Stage (MIS) 4, and the disappearance of an iconic late Pleistocene
Alex Mackay, Caroline R. Cartwright
wiley   +1 more source

The Coral of Plants

Acta Societatis Botanicorum Poloniae, 2020
The present article has two primary objectives. First, the article provides a historical overview of graphical tools used in the past centuries for summarizing the classification and phylogeny of plants.
János Podani
doaj   +1 more source

Multi‐proxy reconstruction of the Holocene vegetation and land use dynamics in the Julian Alps, north‐west Slovenia

Journal of Quaternary Science, Volume 38, Issue 1, Page 107-122, January 2023., 2023
Abstract Small mountain lakes are natural archives for understanding long‐term natural and anthropogenic impact on the environment. This study focused on long‐term (last ca. 13 000 years) vegetation changes and sedimentary processes in the catchment area of Lake Planina pri jezeru (1430 m a.s.l.) by using mineralogical, geochemical and palynological ...
Nina Caf, Pierre Sabatier, Andrej Šmuc, Nives Ogrinc, Matej Dolenec, William Rapuc, Doris Potočnik, Ulrich von Grafenstein, Maja Andrič   +8 more
wiley   +1 more source

Paleontological Tests: Human-like Intelligence is not a Convergent Feature of Evolution [PDF]

arXiv, 2007
We critically examine the evidence for the idea that encephalization quotients increase with time. We find that human-like intelligence is not a convergent feature of evolution. Implications for the search for extraterrestrial intelligence are discussed.
arxiv  

A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain)

The Anatomical Record, EarlyView.
Abstract The eusuchian crocodyliforms recorded in the Eocene levels of the Spanish Duero Basin belong to three lineages: Planocraniidae, with the species Duerosuchus piscator; Alligatoroidea, represented by several specimens of the genus Diplocynodon; and Crocodyloidea, which includes several specimens traditionally attributed to Asiatosuchus.
Iván Narváez, Ane de Celis, Fernando Escaso, Santiago Martín de Jesús, Adán Pérez‐García, Francisco Ortega   +5 more
wiley   +1 more source

Issues of paleontology, stratigraphy and historical geology in the treatise of N. Stenon «On the solid, naturally contained in the solid»

Известия высших учебных заведений: Геология и разведка, 2019
The 350th anniversary of the publication of Nicholas Stenon's treatise «On the solid, naturally contained in the solid» is marked in 2019. This work proves possibility of interpretation of spatial relations of layers of rocks from the point of view of ...
L. V. Novgorodova, F. F. Akhunov, R. V. Eremenko, V. N. Коmarоv   +3 more
doaj   +1 more source