Results 11 to 20 of about 24,714 (307)

Cambrian Hopf algebras

open access: yesAdvances in Mathematics, 2017
60 pages, 43 figures. Version 2: New Part 3 on Schr\"oder Cambrian Algebra.
Gregory Chatel, Vincent Pilaud
exaly   +7 more sources

Predicting surface abundance of federally threatened Jollyville Plateau Salamanders (Eurycea tonkawae) to inform management activities at a highly modified urban spring [PDF]

open access: yesPeerJ, 2022
Urban expansion has contributed to the loss of habitat for range restricted species across the globe. Managing wildlife populations within these urban settings presents the challenge of balancing human and wildlife needs.
Zachary C. Adcock   +6 more
doaj   +2 more sources

New occurrence records for Eurycea tonkawae Chippindale, Price, Wiens & Hillis, 2000 (Caudata, Plethodontidae) from an urbanized watershed in Travis County, Texas, USA [PDF]

open access: yesCheck List, 2020
We report two new occurrence records for Jollyville Plateau Salamanders, Eurycea tonkawae Chippindale, Price, Wiens & Hillis, 2000, from an urbanized watershed in Travis County, Texas, USA.
Zachary C. Adcock   +6 more
doaj   +3 more sources

The morphological disparity, ecological evolution and palaeobiogeography of Palaeozoic hyoliths [PDF]

open access: yesEstonian Journal of Earth Sciences, 2023
Hyolitha is a group of extinct invertebrates, the most dominant benthic animals within the Cambrian evolutionary fauna and forming a part of the Palaeozoic evolutionary fauna.
Fan Liu   +5 more
doaj   +1 more source

A methodological scheme to analyse the early Palaeozoic biodiversification with the example of echinoderms [PDF]

open access: yesEstonian Journal of Earth Sciences, 2023
The early Palaeozoic biodiversification is the most significant radiation of marine ecosystems of Earth’s history, starting with the appearance of invertebrate organisms near the Precambrian–Cambrian boundary and followed by a significant ...
Pauline Guenser   +3 more
doaj   +1 more source

Muscle attachment scars in helcionelloids from Denmark cast light on mollusc evolution in the Cambrian [PDF]

open access: yesActa Palaeontologica Polonica, 2023
Multiple, small (diameter
JOHN S. PEEL, VIVIANNE BERG-MADSEN
doaj   +1 more source

Characteristics and exploration prospect of dolograinstone beach reservoir in Xixiangchi Formation, Cambrian, Sichuan Basin

open access: yesShiyou shiyan dizhi, 2022
The Cambrian Xixiangchi Formation is an important succeeding stratum for gas exploration[JP] in the Lower Paleozoic of the Sichuan Basin, for which, the exploration degree is low, and the main controlling factors of large-scale[JP] reservoirs have not ...
Shuyuan SHI   +14 more
doaj   +1 more source

A new Cambrian catillicephalid trilobite from the Shallow Bay Formation of western Newfoundland, Canada [PDF]

open access: yesActa Palaeontologica Polonica, 2022
Species of Catillicephala are known from sites around the mid-Cambrian margin of Laurentian North America, including Vermont, Quebec, Newfoundland and North Greenland. Catillicephala cifellii sp. nov.
STEPHEN R. WESTROP, ALYCE A. DENGLER
doaj   +1 more source

The oldest brachiopods from the lower Cambrian of South Australia [PDF]

open access: yes, 2011
The morphology and organophosphatic shell structure of the paterinate brachiopod Askepasma is documented using new and previously collected specimens from the lower Cambrian of South Australia.
Stolk, Sandra Pettersson   +27 more
core   +2 more sources

LITHOLOGICAL AND FACIAL FEATURES, COMPOSITION, AND SEDIMENTATION CONDITIONS OF TERRIGENOUS-CARBONATE ROCKS OF THE MOTY GROUP (SHAMAN CLIFF, IRKUTSK REGION)

open access: yesГеодинамика и тектонофизика, 2021
We have studied terrigenous-carbonate rocks in the area near the Sayan mountains in the Irkutsk Region (Russia), specifically at the Shaman Cliff, being the stratotype area of rocks that belong to the Moty group.
Z. L. Motova   +2 more
doaj   +1 more source

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