Tazareh Section, Alburz Mts, Storm dominated shelf fazies 1 (Jurassic to of Iran)

Where: Iran (36.4° N, 54.5° E: paleocoordinates 13.5° S, 47.9° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Shemshak Formation, Middle Toarcian to Middle Toarcian (182.0 - 175.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, bioturbated, fine-grained, silty sandstone and argillaceous siltstone

• Storm dominated shelf environment; Altogether, the facies associations discussed here are interpreted as having been deposited on a middle siliciclastic shelf, sandwiched between sediments of the inner and outer shelf
• Bioturbated silty fine-grained sand, more rarely argillaceous silt, usually with abundant comminuted plant debris, common wood fragments, scattered small ferruginous concretions, and silty fine-grained sandstone nodules

Size class: macrofossils

Primary reference: F. T. Fürsich, M. Wilemsen, K. Seyed-Emami, F. Cecca, and M. R. Majidifard. 2005. The upper Shemshak Formation (Toarcian–Aalenian) of the Eastern Alborz (Iran): Biota and palaeoenvironments during a transgressive–regressive cycle. Fazies 51:365-384 [M. Aberhan/T. Schossleitner/T. Schossleitner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 141253: authorized by Martin Aberhan, entered by Thomas Schossleitner on 22.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Polychaeta
 Sabellida - Serpulidae
Serpulidae indet. Rafinesque 1835
Bivalvia
 Arcida - Parallelodontidae
Grammatodon (Grammatodon) sp. Meek and Hayden 1860 clam
Grammatodon (Cosmetodon) sp. Branson 1942 clam
 Pectinida - Propeamussiidae
Propeamussium sp. de Gregorio 1884 mud scallop
 Pectinida - Entoliidae
"Entolium corneolum" = Entolium (Entolium) corneolum
"Entolium corneolum" = Entolium (Entolium) corneolum Young and Bird 1828 scallop
 Pectinida - Pectinoidae
Eopecten sp. Douvillé 1897 scallop
Camptonectes (Camptonectes) auritus Schlotheim 1813 scallop
Chlamys sp. Röding 1798 scallop
 Pectinida - Oxytomidae
Oxytoma sp. Meek 1864 scallop
Meleagrinella sp. Whitfield 1855 scallop
 Ostreida - Ostreidae
Ostreidae indet. Rafinesque 1815 oyster
 Ostreida - Pinnidae
Pinna sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Inoperna sp. Conrad 1873 mussel
Modiolus sp. Lamarck 1801 mussel
 Carditida - Astartidae
Nicaniella sp. Chavan 1945 clam
 Pholadida - Ceratomyidae
Ceratomya sp. Sandberger 1864 clam
 Pholadida - Pleuromyidae
Pleuromya sp. Agassiz 1845 clam
 Cardiida - Cardiidae
 Pholadomyida - Pholadomyidae
Pholadomya (Pholadomya) sp. Sowerby 1823 clam
Pholadomya (Bucardiomya) sp. Rollier 1912 clam
Goniomya sp. Agassiz 1842 clam
 Lucinida - Mactromyidae
Mactromya sp. Agassiz 1843 clam
 Trigoniida - Myophorelloidae
 Nuculida -
Nuculida indet. Dall 1889 clam
Gastropoda
 Neogastropoda - Turridae
Pseudomelania sp. Pictet and Campiche 1862 turrid
 Ichnofossils -
Zoophycos sp. Massalongo 1855
Chondrites sp. von Sternberg 1833