Results 21 to 30 of about 14,034 (253)

The calcareous nannofossils and magnetostratigraphic results from the Upper Tithonian-Berriasian of Feodosiya region (Eastern Crimea) [PDF]

open access: yes, 2019
This article is concerned with nannofossil study of Tithonian-Berriasian sediments of Eastern Crimea. The NJT 16, NJT 17a, NJT 17b, NKT, and NK 1 nannofossil zones were determined. The occurrence of Nannoconus kamptneri minor, one of the potential marker-
Arkadiev, V.   +4 more
core   +1 more source

MINERAL COMPOSITION AND STRUCTURAL FEATURES OF JEWELER AMMONITES FROM KOSTROMA REGION

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2017
Detailed mineralogical examination of ammonites of jewelry quality has been carried out by means of radiographical, X-ray microanalyses and electronic microscopy.
D. A. Petrochenkov
doaj   +1 more source

New evidence for the age of the Athol Formation (Middle Jurassic : Bajocian) in the Tusk-1 and Tusk-2 wells, offshore Carnarvon Basin, Western Australia [PDF]

open access: yes, 2010
The co-occurrence of ammonites with palynomorphs in the Athol Formation of the Tusk-1 and Tusk-2 wells drilled in the offshore Carnarvon Basin, Western Australia confirms the Early Bajocian (Middle Jurassic) age of the Dissiliodinium caddaense ...
Darbyshire, D.P. Fiona   +2 more
core   +1 more source

Ontogenetic Trends of Sutural Complexity in Jurassic Ammonites

open access: yesGeosciences, 2022
Ontogenetic sequencing of suture fractal dimensions from a single ammonite specimen was not previously accessible without extreme measures. The necessity for destruction of the full conch due to whorl overlap or, alternatively, the prohibitively ...
Katherine Marriott   +7 more
doaj   +1 more source

Sedimentary Environments and Age Determination of the Chia Gara Formation, Northern Iraq

open access: yesIraqi Geological Journal, 2023
The rock successions of the Chia Gara Formation were studied at two surface sections (Barsarin and Rania) from North-Eastern Iraq. The detailed sedimentological study reveals that the formation consists basically of thin-bedded black limestone ...
Ameen Al-Mansoor   +2 more
doaj   +1 more source

Toarcian oceanic anoxic event: An assessment of global causes using belemnite C isotope records [PDF]

open access: yes, 2005
Two hypotheses have been proposed to explain simultaneous large negative excursions (up to 7% PeeDee belemnite) in bulk carbonate (delta(13)C(carb)) and organic carbon isotope records (delta(13)C(org)) from black shales marking the Toarcian oceanic ...
Bailey, TR   +5 more
core   +1 more source

A new type of shell malformation caused by epizoans in Late Jurassic ammonites from Central Russia [PDF]

open access: yesActa Palaeontologica Polonica, 2016
A new type of shell damage on Late Jurassic ammonite Kachpurites fulgens is described. The new type of shell malformation consists of small elongated pits, arranged in groups on the surface of ammonite shell and concentrated near the terminal aperture ...
Aleksandr A. Mironenko
doaj   +1 more source

Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)

open access: yesGeologica Carpathica, 2018
Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria.
Stoykova Kristalina   +3 more
doaj   +1 more source

What happened to Kemosh? [PDF]

open access: yes, 2016
What happened to Kemosh in the era after Moab’s loss of political independence? The present article first argues that this question is of interest to scholarship on the Hebrew Bible because Kemosh and Yhwh were initially twinlike: both were patron ...
Collin Cornell
core   +1 more source

Early Cretaceous ammonites and dinoflagellates from the Western Tatra Mountains, Poland [PDF]

open access: yesActa Palaeontologica Polonica, 2020
The first Early Cretaceous (Valanginian–Hauterivian) ammonite fauna from the lower part of the Kościeliska Marl Formation (Wściekły Żleb Member) of the Lower Sub-Tatric (Krížna) Nappe, in the Lejowa Valley of the Tatra Mountains are described.
Zdeněk Vašíček   +6 more
doaj   +1 more source

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