Results 21 to 30 of about 11,709 (248)
Journal of Palaeogeography, 2014 The Kutch Basin of western India is famous for its rich assemblages of the Callovian–Oxfordian ammonites. The family Oppelidae Douvillé is the second most diverse ammonite group after perisphinctids during the Middle–Upper Jurassic.
Pinaki Roy
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Acta geologica Polonica, 2019 The lithostratigraphy, biostratigraphy, sequence stratigraphy, ammonite and inoceramid faunas of the Upper Albian, Cenomanian, and Lower Turonian Karai Formation, the highest unit of the Uttatur Group in the Pondicherry Sub-Basin of the Cauvery Basin in ...
A. Gale, W. Kennedy, I. Walaszczyk
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Geological Magazine, 1919 The variability and occasional instability of the Ammonoid suture-line, to which attention has been drawn, the recurrence of similar types, and the frequent asymmetry of the opposing halves of a given suture-line, which is apparent not only in the Dactylioceras commune, figured by Swinnerton & Trueman (fig. 9 on p.
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Geological Magazine, 1920 It is well known that the chambers of Cephalopod shells are connected by an organ called the siphuncle, which passes through the septa by the septal necks. Many investigators who have studied these shells have made careful observations on the siphuncle, hoping thereby to throw light on its functions.
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Ontogenetic Trends of Sutural Complexity in Jurassic Ammonites
Geosciences, 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
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A new type of shell malformation caused by epizoans in Late Jurassic ammonites from Central Russia [PDF]
Acta 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
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Sedimentary Environments and Age Determination of the Chia Gara Formation, Northern Iraq
Iraqi 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
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Известия высших учебных заведений: Геология и разведка, 2019 For the first time, the mineral composition and structural features of jewelry ammonite from mine OJSC «Mikhailovcement» in Ryazan Region are studied in detail. Ammonites are associated with sediments of Callovian and Oxfordian stages.
D. A. Petrochenkov, A. V. Petrov
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MINERAL COMPOSITION AND STRUCTURAL FEATURES OF JEWELER AMMONITES FROM KOSTROMA REGION
Известия 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
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Geologica 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
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