Okha Shell Limestone Mbr, Chaya Fm (Pleistocene of India)

Where: India (22.0° N, 70.5° E: paleocoordinates 22.0° N, 70.5° E)

• coordinate stated in text

• local area-level geographic resolution

When: Okha Shell Limestone Member (Chaya Formation), Late/Upper Pleistocene (0.1 - 0.0 Ma)

• STRATIGRAPHIC RELATIONS: From Okha Shell Limestone Member of Chaya Fm, which conformably overlies the Adatiana Fm (Middle Pleistocene) and is conformably overlain by the Aramda Reef Mbr of the Chaya Fm (Late Pleistocene). AGE: Chaya Fm is Late Pleistocene-Late Holocene, but Okha Shell Limestone Mbr being the lowermost unit is assigned here to a Late Pleistocene age. Age assignment based on combination of C and U/Th dates (numerous authors cited). STRATIGRAPHIC POSITION: From several beds near base of the Okha Shell Limestone, which is the lowermost unit of the formation.

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; unlithified, shelly/skeletal, conglomeratic limestone

• ENVIRONMENT: Environmental data not clearly reported in text, but obviously from a very shallow water carbonate setting, possibly foreshore or shoreface.
• SPECIFIC LITHOLOGY: From cross-bedded pack to rudstone, bioturbated shell limestone with mega-fossils. LITHIFICATION: Unlithified on the basis of figured specimens.

Size class: macrofossils

Collected by Pandey, Bahadur, Mathur

Collection methods: surface (in situ),

• COLLECTORs: Unknown, probably Pandey, Bahadur, and Mathur. REPOSITORY: Department of Geology, University of Rajasthan, India.

Primary reference: D. K. Pandey, T. Bahadur, and U. B. Mathur. 2007. Stratigraphic distribution and depositional environment of the Chaya Formation along the northwestern coast of Saurashtra Peninsula, western India. Journal of the Geological Society of India 69:1215-1230 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 76318: authorized by Austin Hendy, entered by Austin Hendy on 18.11.2007, edited by Mihaela Krause

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Not exhaustive but comprises all common forms of several megafossil groups, including corals, bivalves, gastropods, trace fossils, and algae. NOMENCLATURE: Fairly modern nomenclature, but often at family or only genus level.
Gastropoda
 Neogastropoda - Turbinellidae
Turbinellidae indet. Swainson 1840 snail
Bivalvia
 Cardiida - Veneridae
Veneridae indet. Rafinesque 1815 venus clam
Anthozoa
 Scleractinia - Merulinidae
"Favia favus" = Dipsastraea favus Forskal 1775 stony coral
Goniastrea sp. Milne-Edwards and Haime 1848 stony coral
Favites sp. Link 1807 stony coral
Platygyra sp. Ehrenberg 1834 stony coral
 Scleractinia - Faviidae
Favia sp. Oken 1815 stony coral
 Scleractinia - Poritidae
Porites sp. Link 1807 stony coral
 Scleractinia - Acroporidae
Acropora sp. Oken 1815 stony coral
 Scleractinia - Montastraeidae
"Montastrea sp." = Montastraea
"Montastrea sp." = Montastraea Blainville 1830 stony coral
 Ichnofossils -
Ophiomorpha sp. Lundgren 1891
Thalassinoides sp. Ehrenberg 1944