Tazareh Section, Alburz Mts, Outer shelf facies 2: Early/Lower Aalenian - Late/Upper Aalenian, Iran

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Crinoidea
Crinoidea indet. Miller 1821
Bivalvia - Trigoniida - Myophorellidae
Myophorella (Myophorella) sp. Bayle 1878
Bivalvia - Pholadomyida - Pholadomyidae
Pholadomya (Bucardiomya) sp. (Rollier 1912)
Bivalvia - Pholadida - Pleuromyidae
Pleuromya sp. (Meek 1873)
original and current combination Myacites (Pleuromya)
Bivalvia - Cardiida - Cardiidae
Protocardia (Protocardia) informal sp. B Beyrich 1845
Bivalvia - Arcida - Arcidae
Arca (Eonavicula) sp. (Arkell 1929)
original and current combination Eonavicula
Bivalvia - Myalinida - Inoceramidae
Pseudomytiloides sp. Koschelkina 1963
Bivalvia - Myalinida - Kolymiidae
Parainoceramus sp. Cox 1954
synonym of Kolymia
Bivalvia - Ostreida - Posidoniidae
Bositra buchii (Roemer 1836)
recombined as Bositra buchi
Bivalvia - Pectinida - Pectinidae
Chlamys sp. Röding 1798
Bivalvia - Pectinida - Entoliidae
Entolium corneolum (Young and Bird 1828)
recombined as Entolium (Entolium) corneolum
Rhynchonellata - Terebratulida
Terebratulida indet. Waagen 1883
Polychaeta - Sabellida - Serpulidae
Serpulidae indet. Rafinesque 1835
Malacostraca - Decapoda - Glypheidae
Glyphea sp. Von Meyer 1835
see common names

Geography
Country:Iran
Coordinates: 36.4° North, 54.5° East (view map)
Paleocoordinates:13.8° South, 47.7° East
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Jurassic Epoch:Middle Jurassic
Stage:Aalenian 10 m.y. bin:Jurassic 3
Key time interval:Early/Lower Aalenian - Late/Upper Aalenian
Age range of interval:174.70000 - 170.90000 m.y. ago
Stratigraphy
Formation:Shemshak
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:bioturbation,gray lithified argillaceous siltstone
Lithology description: Facies of the outer shelf are fairly monotonous, dark grey in colour, highly bioturbated, and range from silt to argillaceous silt with plant debris. Scattered small concretions with a calcareous or ferruginous cement occur in parts of the section.
Environment:transition zone/lower shoreface
Geology comments: The monotonous facies clearly corresponds to the deepest part of the shelf, well below the influence of storms. Sedimentation rates were low enough for the sediment to become totally bioturbated.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:141261
Authorizer:M. Aberhan Enterer:T. Schossleitner
Research group:marine invertebrate
Created:2013-03-23 05:34:03 Last modified:2013-03-22 13:34:03
Access level:the public Released:2013-03-23 05:34:03
Creative Commons license:CC BY
Reference information

Primary reference:
45909. 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]