Yakacik Valley (Jurassic of Turkey)

Where: Turkey (40.1° N, 32.8° E: paleocoordinates 40.0° N, 36.0° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sinemurian (199.3 - 190.8 Ma)

• The ammonites collected by the author were examined by Dr. M. K. Howarth of the British Museum (Natural History). He identified Coroniceras cf. C. rotiforme (J. de C. Sowerby) and Phylloceras alontinum (Gemmellaro), both indicative of the C. bucklandi zone, from the east side of the valley, and Eoderoceras cf. E. armatum (J. Sowerby), indicative of the raricostatum zone from the west side. Several of the brachiopod species, however, were found on

•both sides of the valley, and it seems probable that they came from the same highly condensed succession of the Lower and Middle Lias.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, red limestone

• dark red limestone

Size classes: macrofossils, mesofossils

Reposited in the BMNH

Primary reference: D. V. Ager. 1959. Lower Jurassic Brachiopods From Turkey. Journal of Paleontology 33(6):1018-1028 [M. Clapham/M. Manojlovic]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 159017: authorized by Matthew Clapham, entered by Marko Manojlovic on 25.07.2014, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Eoderoceratidae
Eoderoceras cf. armatum Sowerby 1815 ammonite
 Ammonitida - Arietitidae
Coroniceras cf. rotiforme Sowerby 1824 ammonite
 Phylloceratida - Phylloceratidae
"Phylloceras alontinum" = Calliphylloceras alontinum
"Phylloceras alontinum" = Calliphylloceras alontinum Gemmellaro 1884 ammonite
Rhynchonellata
 Spiriferinida - Spiriferinidae
Spiriferina sp. d'Orbigny 1847
 Terebratulida - Nucleatidae
"Propygope aspasia" = Linguithyris aspasia
"Propygope aspasia" = Linguithyris aspasia Zittel 1869
 Terebratulida - Zeilleriidae
Zeilleria lycetti Davidson 1851
"Zeilleria indentata" = Zeilleria (Zeilleria) indentata Sowerby 1824
Cincta numismalis Lamarck 1819
 Rhynchonellida - Rhynchonellidae
Homoeorhynchia acuta Sowerby 1816
Piarorhynchia juvenis Quenstedt 1852
 Rhynchonellida - Wellerellidae
Cirpa kiragliae n. sp. Ager 1959
also includes subspecies cirpa kiragliae globosa
 Rhynchonellida - Norellidae
Holcorhynchia yakacikensis n. sp. Ager 1959