Dansirit Formation

Dansirit Formation
Stratigraphic range: Aalenian-Bajocian
~175–165 Ma

PreꞒ

Ꞓ

O

S

D

C

P

T

J

K

Pg

N
Dansirit Formation; Stratigraphic range: Aalenian-Bajocian; ~175–165 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Shemshak Group
Underlies	Dalichai Formation
Overlies	Fillzamin & Shirindasht Formations
Thickness	over 200 metres (660 ft)
Lithology
Primary	Sandstone
Other	Shale, siltstone
Location
Coordinates	36.2°N 51.7°E
Approximate paleocoordinates	29.1°N 59.8°E
Region	Mazandaran
Country	Iran
Extent	Alborz Mountains
	Dansirit Formation (Iran)

The Dansirit Formation is a geological formation in Iran. It is Middle Jurassic in age, dating from the Aalenian to Bajocian.

Description

It is part of the Shemshak Group, a Late Triassic to Callovian set of coal bearing largely fluvo-lacustrine sediments up to 4000 metres thick located within the Alborz Mountains.[1] The outcrop of sediments is strongly controlled by numerous fault structures in the region. The formation predominantly consists of sandstone, with subordinate siltstone and shale. Dinosaur tracks are known from the formation, including sauropods, and tridactlyl[2] and didactyl theropods.[3] A diverse fossil flora is also known from the formation.[4]

References

Fürsich, Franz Theodor; Wilmsen, Markus; Seyed-Emami, Kazem; Majidifard, Mahmoud Reza (2009). "Lithostratigraphy of the Upper Triassic–Middle Jurassic Shemshak Group of Northern Iran". Geological Society, London, Special Publications. 312 (1): 129–160. doi:10.1144/SP312.6. ISSN 0305-8719.
Abbassi, Nasrollah; Madanipour, Saeed (2014-04-01). "Dinosaur tracks from the Jurassic Shemshak Group in the Central Alborz Mountains (Northern Iran)". Geologica Carpathica. 65 (2): 99–115. doi:10.2478/geoca-2014-0007. ISSN 1336-8052.
Xing, Lida; Abbassi, Nasrollah; Lockley, Martin G. (2018-11-17). "Enigmatic didactyl tracks from the Jurassic of Iran". Historical Biology. 30 (8): 1132–1138. doi:10.1080/08912963.2017.1339700. ISSN 0891-2963.
Vaez-Javadi, Fatemeh (March 2011). "Middle Jurassic flora from the Dansirit Formation of the Shemshak Group, Alborz, north Iran". Alcheringa: An Australasian Journal of Palaeontology. 35 (1): 77–102. doi:10.1080/03115518.2010.489424. ISSN 0311-5518.

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[1] Fürsich, Franz Theodor; Wilmsen, Markus; Seyed-Emami, Kazem; Majidifard, Mahmoud Reza (2009). "Lithostratigraphy of the Upper Triassic–Middle Jurassic Shemshak Group of Northern Iran". Geological Society, London, Special Publications. 312 (1): 129–160. doi:10.1144/SP312.6. ISSN 0305-8719.

[2] Abbassi, Nasrollah; Madanipour, Saeed (2014-04-01). "Dinosaur tracks from the Jurassic Shemshak Group in the Central Alborz Mountains (Northern Iran)". Geologica Carpathica. 65 (2): 99–115. doi:10.2478/geoca-2014-0007. ISSN 1336-8052.

[3] Xing, Lida; Abbassi, Nasrollah; Lockley, Martin G. (2018-11-17). "Enigmatic didactyl tracks from the Jurassic of Iran". Historical Biology. 30 (8): 1132–1138. doi:10.1080/08912963.2017.1339700. ISSN 0891-2963.

[4] Vaez-Javadi, Fatemeh (March 2011). "Middle Jurassic flora from the Dansirit Formation of the Shemshak Group, Alborz, north Iran". Alcheringa: An Australasian Journal of Palaeontology. 35 (1): 77–102. doi:10.1080/03115518.2010.489424. ISSN 0311-5518.