Results 61 to 70 of about 8,490 (221)

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

open access: yesThe Anatomical Record, Volume 309, Issue 10, Page 2656-2697, October 2026.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Microfossils With Suggested Affinities To The Pyramimonadales (Pyramimonadophyceae, Chlorophyta) From The Lower Devonian Rhynie Chert

open access: yesActa Palaeobotanica, 2014
An assemblage of unusual microfossils occurs within an accumulation of plant debris, hyphae, and various types of propagules in the Early Devonian Rhynie chert.
Kustatscher Evelyn   +3 more
doaj   +1 more source

The Unexpected Discovery of Paleocene? Coals in Outcrops Thought to Be Cambrian, Al Huqf, Oman

open access: yesJournal of Petroleum Geology, Volume 49, Issue 4, Page 1179-1194, October 2026.
ABSTRACT Two brown organic deposits were encountered whilst investigating kaolinitic claystones thought to occur at the base of a Cambrian formation at outcrop. The age of these organic deposits is probably Paleocene from palynology. Organic petrography shows that they are subbituminous coals with some oil source potential.
Mohammed H. Al Kindi   +4 more
wiley   +1 more source

The Oral Microbiome of King Richard III of England

open access: yesAmerican Journal of Biological Anthropology, Volume 191, Issue 1, September 2026.
ABSTRACT Objectives Metagenomic investigations of ancient dental calculus provide insights into oral health, disease, and diet. Here, we analyze the dental calculus metagenome of King Richard III of England (1452–1485). Materials and Methods Dental calculus DNA was extracted from three teeth of King Richard III and shotgun sequenced to a depth of ...
Irina M. Velsko   +15 more
wiley   +1 more source

AI‐assisted identification of stromatoporoids

open access: yesThe Depositional Record, Volume 12, Issue 4, September 2026.
AI models integrating vertical and transverse thin‐section images accurately classify Silurian stromatoporoid taxa, achieving up to 97% accuracy. This dual‐orientation framework mirrors traditional taxonomy, reveals patterns of morphological continuity, and provides a scalable, quantitative approach for advancing automated fossil identification ...
David Rodríguez González   +3 more
wiley   +1 more source

How to Recover Microfossils from Common Iowa Rocks [PDF]

open access: yes, 1976
The rocks of Iowa contain a great abundance and variety of fossils. Megafossils, those fossils of sufficient size to be seen with the unaided eye, are abundant in many Iowa quarries and roadcuts and are therefore common in most fossil collections of Iowa
Anderson, Wayne I.
core   +1 more source

Detrital zircon ages, Lu‐Hf isotopes of zircon grains, Sr‐Nd isotopes on whole rock and geochemistry of Campanian turbidites in the Eastern Pontides (NE Türkiye): A provenance assessment and Gondwana records

open access: yesThe Depositional Record, Volume 12, Issue 4, September 2026.
These findings confirm that the Campanian‐aged Bozbent Member turbiditic sequence in the Eastern Pontides was deposited in an extensional fore‐arc basin and therefore exhibits the petrographic and geochemical characteristics of passive margin sandstones.
Çiğdem Saydam Eker   +6 more
wiley   +1 more source

Radiolarian micropalaeontology: examining radiolaria under the microscope

open access: yes, 2010
Professor Simon Haslett discusses examining radiolarian microfossils under the microscope. Radiolaria are marine single-celled organisms that possess a silica shell and are preserved in the fossil record.
Haslett, Prof. Simon K.   +1 more
core  

Image Databases for Pollen Grain Classification: Availability, Quality, and Challenges

open access: yesWIREs Data Mining and Knowledge Discovery, Volume 16, Issue 3, September 2026.
Overview of the study process, from identifying gaps in pollen image databases to a systematic search across six libraries, resulting in 73 final studies, 18 datasets (10 public), and a seven‐point standardization framework proposed under FAIR principles.
Heloise Acco Tives Bedin   +4 more
wiley   +1 more source

Radiolarian micropalaeontology: extracting radiolaria from sediment

open access: yes, 2010
Professor Simon Haslett discusses extracting radiolarian microfossils from rocks and sediments. Radiolaria are marine single-celled organisms that possess a silica shell and are preserved in the fossil record.
Haslett, Prof. Simon K.   +1 more
core  

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