Porbandar Calcarenite Mbr, Chaya Fm (Holocene 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: Porbandar Calcarenite Member (Chaya Formation), Holocene (0.0 - 0.0 Ma)

• STRATIGRAPHIC RELATIONS: From Porbandar Calcarenite Mbr of Chaya Fm, which conformably overlies the Aramda Reef Mbr of the Chaya Fm (Late Pleistocene) and is unconformably overlain by the Katpur Fm (Middle Holocene). AGE: Chaya Fm is Late Pleistocene-Late Holocene, and with the Porbandar Calcarenite Mbr being the upper unit of the formation it is assigned here to a Holocene age. Age assignment based on combination of C and U/Th dates (numerous authors cited). STRATIGRAPHIC POSITION: From several beds throughout the Porbandar Calcarenite Mbr, which is the upper unit of the formation.

• member-level stratigraphic resolution

Environment/lithology: foreshore; poorly lithified, shelly/skeletal grainstone

• ENVIRONMENT: Dune and foreshore setting.
• SPECIFIC LITHOLOGY: Semi-consolidated to consolidated calcarenite with megafossils (pack to grainstone/rudstone). LITHIFICATION: Poorly lithified on the facies description.

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 76320: authorized by Austin Hendy, entered by Austin Hendy on 18.11.2007

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.
unclassified
  -
Foraminifera
 Rotalioidea - Elphidiidae
Elphidium sp. Monfort 1808
Florideophyceae
 Corallinales - Corallinophycidae
Amphiroa sp. Lamoroux 1812
Anthozoa
 Scleractinia - Merulinidae
Favites sp. Link 1807 stony coral
Platygyra sp. Ehrenberg 1834 stony coral
 Scleractinia - Faviidae
Favia sp. Oken 1815 stony coral
Gastropoda
 Cerithioidea - Cerithiidae
Cerithium sp. Bruguière 1789 cerith snail
 Neogastropoda - Olividae
Oliva sp. Bruguière 1789 olive snail
 Sorbeoconcha - Rissoidae
Rissoidae indet. Gray 1847 snail
 Neritoidea - Neritidae
Nerita sp. Linnaeus 1758 snail
Bivalvia
 Cardiida - Corbiculidae
 Carditida - Carditidae
Carditidae indet. Fleming 1820 clam
 Life -
? Ophiomorpha sp. Lundgren 1891
? Thalassinoides sp. Ehrenberg 1944