Knockerk House Sandstone Mbr, Lower Caradoc, Ireland, Collon Quarry (Ordovician of Ireland)

Where: Ireland (53.8° N, 6.6° W: paleocoordinates 48.9° S, 20.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Knockerk House Sandstone Member (Knockerk Formation), Caradoc (458.4 - 449.5 Ma)

• Lower Caradoc

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; sandstone and siltstone

• Consists of massive volcanic sandstones, with tuffaceous shales sporadically present at the base of the unit but more common at the top.

Preservation: mold/impression

Primary reference: M. Romano and A. W. Owen. 1993. Early Caradoc Trilobites of Eastern Ireland and their paleogeographical significance. Palaeontology 36(3):681-720 [M. Patzkowsky/Z. Krug/Z. Krug]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 50601: authorized by Mark Patzkowsky, entered by Zack Krug on 18.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Trilobites only.
Trilobita
 Phacopida - Calymenidae
Gravicalymene sp. Shirley 1936 trilobite
 Phacopida - Pterygometopidae
Achatella ? truncatocaudata Portlock 1843 trilobite
 Phacopida - Encrinuridae
? Atractopyge sp. Hawle and Corda 1847 trilobite
 Phacopida - Cheiruridae
 Corynexochida - Illaenidae
Illaenus sp. Dalman 1827 trilobite
 Lichida -
Lichida indet. Moore 1959 trilobite
 Lichida - Lichidae
Amphilichas sp. Raymond 1905 trilobite