Gulani, Zambuk Ridge (Cretaceous of Nigeria)

Where: Nigeria (10.7° N, 11.7° E: paleocoordinates 4.3° S, 4.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pindiga Formation, Early/Lower Turonian (93.5 - 89.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Pindiga Fm (Turonian-Coniacian), which overlies the Yolda Fm (Cenomanian) is overlain by the Gulani Fm (Santonian-Maastrichtian). AGE: Early Turonian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From unknown position within the section.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified, concretionary, shelly/skeletal limestone and lithified, blue shale

• ENVIRONMENT: Presumably an shallow siliciclastic marine facies.
• SPECIFIC LITHOLOGY: Alternating fossiliferous and nodular or rubbly limestones and blue shales; fossils from limestones. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: surface (in situ),

• COLLECTOR: Not stated in text, but presumably including the authors. REPOSITORY: Not stated in text.

Primary reference: W. Barber. 1957. Lower Turonian ammonites from north-eastern Nigeria. Geological Survey of Nigeria Bulletin 26:1-87 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 83023: authorized by Austin Hendy, entered by Austin Hendy on 05.08.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for ammonoids and bivalves, and sometimes including fish. NOMENCLATURE: Not an authoritative publication, and with somewhat antiquated nomenclature. Mostly identified to species resolution.
Cephalopoda
 Ammonitida - Vascoceratidae
"Paravascoceras costatum" = Vascoceras proprium Reyment 1954 ammonite
Vascoceras ellipticum Barber 1957 ammonite
Vascoceras bulbosum Reyment 1954 ammonite
Vascoceras globosum Reyment 1954 ammonite
includes ssp. plenum, proprium, compressum
 Ammonitida - Pseudotissotiidae
"Pseudotissotia (Wrightoceras) wallsi" = Thomasites wallsi, "Gombeoceras gongilense" = Thomasites gongilensis, "Pseudotissotia (Bauchioceras) nigeriensis" = Pseudotissotia nigeriensis
"Pseudotissotia (Wrightoceras) wallsi" = Thomasites wallsi Reyment 1954 ammonite
"Gombeoceras gongilense" = Thomasites gongilensis Woods 1911 ammonite
includes ssp. lautum, compressum, subtenue
"Pseudotissotia (Bauchioceras) nigeriensis" = Pseudotissotia nigeriensis Woods 1911 ammonite
includes ssp. tricarinata, plana
Bivalvia
 Ostreida - Pteriidae
Pteria kitsoni Cox 1952 pearl oyster
 Ostreida - Gryphaeidae
"Exogyra olisiponensis" = Costagyra olisiponensis
"Exogyra olisiponensis" = Costagyra olisiponensis Sharpe 1850 oyster