Bed 3 - Vindobonian Marl (Chokrakian) (Miocene of Iran)

Where: Iran (36.0° N, 51.2° E: paleocoordinates 35.5° N, 50.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Vindobonian Marl Formation, Middle Miocene (16.0 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From Vindobonian Marl, which overlies unnamed Paleocene strata, and is overlain by the "Karagan" Spaniodontella bed. THICKNESS: From unit of 40-50 m thick, within section that totals ~375 m. AGE: Chokrakian (Middle Miocene). STRATIGRAPHIC POSITION: From bed 3 (upper of two units in the Vindobonian Marl.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, concretionary, gray, green, sandy claystone and poorly lithified, concretionary, gray, green, sandy marl

• ENVIRONMENT: Shallow marine siliciclastic environment, possibly nearshore based on faunal composition.
• SPECIFIC LITHOLOGY: Claystone and marl, greenish grey, nodular; and sandstone, calcareous, vert fine-grained, reddish-brown, thinly laminated, thick-bedded; containing abundant fossils. LITHIFICATION: Poorly-lithified, on the basis of presence of concretions.

Size class: macrofossils

Collection methods: surface (in situ),

• COLLECTOR: Not stated, presumbaly P. E. Süssli. REPOSITORY: Not stated, presumably Geological Survey of Iran.

Primary reference: P. E. Süssli. 1976. The Geology of the Lower Haraz Valley area, Central Alborz, Iran. Geological Society of Iran Report 38 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 77195: authorized by Austin Hendy, entered by Austin Hendy on 30.12.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Antiquated, but mostly assigned to species level.
Bivalvia
 Arcida - Arcidae
Arca sp. Linnaeus 1758 ark
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
 Mytilida - Crenellidae
Musculus sp. Roding 1798 mussel
 Pholadida - Corbulidae
"Corbula gibba" = Corbula (Varicorbula) gibba
"Corbula gibba" = Corbula (Varicorbula) gibba Oliva 1792 clam
 Pholadida - Pholadidae
Barnea sp. Leach 1826 clam
 Cardiida - Veneridae
Tapes taurica venus clam
Tapes sp. Mühlfeld 1811 venus clam
 Cardiida - Cardiidae
Gastropoda
 Cephalaspidea - Retusidae
"Cylichnina aff. melitopolitana" = Retusa (Cylichnina)
"Cylichnina aff. melitopolitana" = Retusa (Cylichnina) snail
 Neogastropoda - Buccinidae
Buccinum sp. Linnaeus 1758 true whelk