NHM "Ormoceras" locality (Ordovician of Saudi Arabia)

Also known as Tabuk Fm., Hanadir Mbr.

Where: Tabuk, Saudi Arabia (28.5° N, 36.0° E: paleocoordinates 48.0° S, 133.6° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Hanadir Member (Tabuk Formation), Late/Upper Llanvirn (463.5 - 460.9 Ma)

• see discussion in the primary reference

• bed-level stratigraphic resolution

Environment/lithology: shoreface; micaceous, pebbly, shelly/skeletal, argillaceous, silty sandstone

• "The cephalopods are preserved in a poorly sorted, silty sandstone in which a small proportion of larger grains up to 0.5mm in diameter is present. The large grains are composed of individual feldspars, pyroxenes and/or amphiboles, iron oxides and muscovite. Small angular clasts of shale (2-5mm across) are also present. Apart from fragments of cephalopod shell, the component shelly material includes trilobite exuviae. All the shell fragments rest in positions parallel to the bedding and show some evidence of imbrication; in general, they rest facing concave down. Layering suggestive of cross-ripple lamination is also present."

Size class: macrofossils

Preservation: recrystallized, replaced with dolomite, replaced with siderite, replaced with limonite

Collected by R. Warberton in 1968; reposited in the BMNH

Collection methods: bulk,

• colletion is stored in the Natural History Museum, London (NHM)

Primary reference: D. H. Evans. 2000. A Cephalopod Fauna from the Middle Ordovician of Saudi Arabia. Palaeontology 43(3):573-589 [B. Kröger/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87733: authorized by Björn Kröger, entered by Torsten Liebrecht on 23.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Orthocerida - Sactoceratidae
? Sactoceras sp.
? Sactoceras sp. Hyatt 1884
BMNH C89593 to C89598, C89591 (part); the latter comprises "as many as 26 individuals"
 Actinocerida - Georginidae
? Mesaktoceras sp.
? Mesaktoceras sp.
BMNH C85318, C85319, C89599, C89591 (part); the latter comprises 3 individuals
Trilobita
 Phacopida - Calymenidae
Neseuretus sp.
Neseuretus sp. Hicks 1873 trilobite