Ammonites of the subfamily Mayaitinae Spath, 1928 from the Oxfordian of Kachchh, Western India

Alberti, Matthias; Pandey, Dhirendra K.; Hethke, Manja; Fürsich, Franz T.

doi:10.1016/j.geobios.2015.02.005

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…159.4–161.4 Myr; Gradstein et al, 2012). The only species described by Alberti et al (2015) come from the lower Oxfordian part of the Dhosa Oolite. From these faunal occurrences, it appears that the Turritella -bearing horizons are either early Oxfordian or middle Oxfordian in age.…”

Section: Geologic Settingmentioning

confidence: 93%

“…Asterisk (*) marks the sampling points. Modified after Roy et al (2012), based on Waagen (1875); Spath (1928, 1931); Fürsich and Heinze (1998); Fürsich et al (2001); Roy et al (2012); and Alberti et al (2015). …”

Section: Geologic Settingmentioning

confidence: 99%

“…Spath, on the other hand, described all species of Paryphoceras from the Dhosa Oolite Member without specifying from which part of the unit the species came. Alberti et al (2015) revised the species of Paryphoceras of Kutch, and concluded that the majority of the species are found in the middle Oxfordian ( Cardioceras cordatum to Gregoryceras transversarium zones; ca. 159.4–161.4 Myr; Gradstein et al, 2012).…”

Section: Geologic Settingmentioning

confidence: 99%

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The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

Das¹,

Saha²,

Bardhan³

et al. 2018

J. Paleontol.

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Turritellid gastropods are important components of many Cretaceous–Recent fossil marine faunas worldwide. Their shell is morphologically simple, making homoplasy widespread and phylogenetic analysis difficult, but fossil and living species can be recognized based on shell characters. For many decades, it has been the consensus that the oldest definite representatives of Turritellidae are from the Lower Cretaceous, and that pre-Cretaceous forms are homeomorphs. Some morphological characters of the present turritelline species resemble those of mathildoids, but many diagnostic characters clearly separate these two groups. We here describe and/or redescribe—based on examination of more than 2600 near complete specimens—four species from the Upper Jurassic Dhosa Oolite Member of the Chari Formation in Kutch, western India, and demonstrate that they are members of Turritellidae, subfamily Turritellinae, on the basis of diagnostic characters including apical sculptural ontogeny (obtained from SEM study), spiral sculpture, and growth line patterns. The four species are in order of abundance, Turritella jadavpuriensis Mitra and Ghosh, 1979; Turritella amitava new species; Turritella jhuraensis Mitra and Ghosh, 1979, and Turritella dhosaensis new species. The turritelline assemblages occur only on the northeastern flank of the Jhura dome (23°24’47.57”N, 69°36’09.26”E). Age of the Dhosa Oolite has recently been confirmed based on multiple ammonite species. All these points indicate that these fossils are the oldest record of the family Turritellidae—by almost 30 million years—in the world.

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Section: Geologic Settingmentioning

confidence: 93%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

See 1 more Smart Citation

The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

Das¹,

Saha²,

Bardhan³

et al. 2018

J. Paleontol.

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“…from their top Kimmeridgian horizons in their Pachysphinctes assemblage (ca. 13 m thick), together with Cariou 1997, 1999;Alberti et al 2015).…”

Section: Se-neotethyan Palaeomargin (Himalayas: Spiti Nepal)mentioning

confidence: 98%

First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India

Pandey¹,

Fürsich²,

Alberti³

et al. 2022

ZITT

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A Hildoglochiceras-rich horizon is reported from a thin carbonate intercalation within the siliciclastic Upper Jurassic Jhuran Formation of the Jara Dome, western Kachchh Mainland. The Hildoglochiceras specimens have been used for the first population-level study of the genus based on a multivariate analysis. High phenotype instability in the large sample confirms the occurrence of transient forms between morphospecies. Key morphological traits for interpreting Hildoglochiceras are stated, and the morphospecies Hildoglochiceras kobelli (Oppel) and H. kobelliforme (Bonarelli) are interpreted as a dimorphic pair. The ammonite-rich level is interpreted as a Hildoglochiceras Horizon, which is related to a transgressive pulse and maximum flooding zone interrupting largely restrictive conditions for ammonites. The endemic character of Hildoglochiceras is confirmed and related to its environmental restriction to shelf areas on the palaeomargins of the Trans-Erythraean Trough. A comprehensive review of biostratigraphic interpretations of Hildoglochiceras shows the influence of natural and experimental forcing factors. The uppermost Kimmeridgian to lowermost Upper Tithonian interval is the widest biostratigraphic range assumable for Hildoglochiceras based on existing reports, but most probably it was restricted to, or at least better represented in, Lower Tithonian horizons. The Hildoglochiceras Horizon described here is correlated with a lower part of the Albertinum/Darwini Zone in the Secondary Standard Scale for ammonite-based bio-chronostratigraphy in European and West-Tethyan areas. According to the current state of knowledge, a local rather than wide regional significance is favoured for Hildoglochiceras records before its significance for precise correlation across the Trans-Erythraean Trough.

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Overview on the Middle to Upper Jurassic Sedimentary Succession of Gangta Bet in the Kachchh Basin, Western India, with Special Emphasis on its Lithostratigraphy, Biostratigraphy, and Palaeoenvironment

Alberti

Fürsich

Pandey

et al. 2017

Journal of the Geological Society of India

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The Jurassic succession of Gangta Bet in the Kachchh basin of western India comprises around 130 m of mostly siliciclastic rocks. The strata belong to the Gangta Member of the Gadhada Formation and are herein sub-divided into four units: the Gangta sandstone beds, the lower silty sandstone beds, the upper silty sandstone beds, and the Gangta ammonite beds. These units can be separated by three marker horizons: the Brachiopod bed, the Gangta Conglomerate Bed, and the Gervillella Bed. Ammonites indicate an Oxfordian age for the upper half of the succession, but the scarcity of identifiable fossils in its basal part so far prevented precise biostratigraphic assignments. The shallow-water sediments can be interpreted as parasequences as a result of minor sea-level changes. Deposition took place close to the palaeo-coastline at water depths around the fair-weather wave-base.

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Ammonites of the subfamily Mayaitinae Spath, 1928 from the Oxfordian of Kachchh, Western India

Cited by 11 publications

References 34 publications

The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India

Overview on the Middle to Upper Jurassic Sedimentary Succession of Gangta Bet in the Kachchh Basin, Western India, with Special Emphasis on its Lithostratigraphy, Biostratigraphy, and Palaeoenvironment

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Ammonites of the subfamily Mayaitinae Spath, 1928 from the Oxfordian of Kachchh, Western India

Cited by 11 publications

References 34 publications

The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

The oldest turritelline gastropods: from the Oxfordian (Upper Jurassic) of Kutch, India

﻿First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India

Overview on the Middle to Upper Jurassic Sedimentary Succession of Gangta Bet in the Kachchh Basin, Western India, with Special Emphasis on its Lithostratigraphy, Biostratigraphy, and Palaeoenvironment

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First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India