Systematic revision and palaeobiogeography of Perisphinctes Waagen (Ammonoidea) from the Oxfordian of Kutch, India: Stratigraphic and evolutionary implications

Roy, Arindam; Bardhan, Subhendu; Das, Sebabrata; Mondal, Subhronil; Mallick, Sumanta

doi:10.1016/j.palwor.2012.10.001

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…Most parts of the succession are devoid of macrofossils and therefore received less attention. Major concentrations of ammonites occur only in the middle to lower upper Oxfordian Kanthkot Ammonite Beds, as described in a series of studies during the last few years (e.g., Krishna et al, 1996Krishna et al, , 1998Krishna et al, , 2009aKrishna et al, , 2009bKrishna et al, , 2009cRoy et al, 2012;Pandey et al, 2012a).…”

Section: Introductionmentioning

confidence: 81%

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

Alberti¹,

Pandey²,

Hethke³

et al. 2015

Geobios

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Section: Introductionmentioning

confidence: 81%

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

Alberti¹,

Pandey²,

Hethke³

et al. 2015

Geobios

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“…Rocks of both the Patcham and Chari formations were the products of continental shelf margin sedimentation (Datta, 1992; Fürsich et al, 2001). The Dhosa Oolite Member is a condensed, time-averaged unit (Singh, 1989; Fürsich et al, 1992; Pandey et al, 2009; Roy et al, 2012). In sequence stratigraphic terms, it represents a Transgressive System Tract (TST; Fürsich et al, 2001) and Maximum Flooding Zone (MFZ; Fürsich and Pandey, 2003).…”

Section: Geologic Settingmentioning

confidence: 99%

“…The top part of the Dhosa Oolite is hard, conglomeratic, highly fossiliferous, and contains ferruginous oolite. The lower part contains shale and sandstone with sparse oolite (Fürsich et al, 2001; Roy et al, 2012) (Fig. 2).…”

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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“…Cox (1988) studied English Callovian perisphinctid ammonites and established sexual dimorphs in many genera. In a series of papers, Bardhan along with others also established sexual dimorphism in species from Kutch of different groups, e.g., Macrocephalitinae (Bhaumik et al, 1993;Datta et al, 1996), Eucycloceratinae (Jana, 2002;Jana et al, 2005), Reineckeiidae (Kayal and Bardhan, 2005), Hecticoceratinae , Phylcticeratinae (Bardhan et al, 2010), Pseudoperisphinctinae , Perisphinctinae (Roy et al, 2012) and Sivajiceratinae (Dutta and Bardhan, 2016; also see Callomon, 1993).…”

Section: Introductionmentioning

confidence: 98%

The taxonomic status of the genus Hubertoceras Spath: A new light on sexual dimorphism from the Callovian ammonites of Kutch, India

Dutta

Bardhan

Paul

et al. 2017

Palaeontologia Electronica

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Systematic revision and palaeobiogeography of Perisphinctes Waagen (Ammonoidea) from the Oxfordian of Kutch, India: Stratigraphic and evolutionary implications

Cited by 9 publications

References 24 publications

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

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

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

The taxonomic status of the genus Hubertoceras Spath: A new light on sexual dimorphism from the Callovian ammonites of Kutch, India

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