Scaphiocoelia Zone trilobites, Lower Icla Fmn., Icla-Padilla region (Devonian of Bolivia)

Where: Chuquisaca, Bolivia (19.0° S, 65.0° W: paleocoordinates 66.6° S, 92.0° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Lower Member (Icla Formation), Emsian (407.6 - 393.3 Ma)

• Scaphiocoelia Zone well recognized. Emsian age follows Isaacson (ref. 9680).

• member-level stratigraphic resolution

Environment/lithology: marine; micaceous, gray mudstone and brown, gray sandstone

• Isaacson (ref. 9681) interprets as very shallow, possibly intertidal.
• From Isaacson (ref. 9681): "The Lower Shale Member commences with a fine-grained sandstone..gray to brown...Next is the "Icla Pavement" [sandstone; symmetrical ripples; fossiliferous]...next is a gray to brown fine-gr sandstone that is medium bedded, [brown]. The remainder of the Lower Shale is mostly covered...mudstone...gray to black, [micaceous]..."

Size class: macrofossils

Primary reference: N. Eldredge and L. Branisa. 1980. Calmoniid trilobites of the Lower Devonian Scaphiocoelia Zone of Bolivia, with remarks on related species. Bulletin of the American Museum of Natural History 165(2):181-289 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 36135: authorized by Michael Foote, entered by Michael Foote on 14.01.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Emphasis is on calmoniids, which make up the majority of Scaphiocoelia Zone trilobites, but other forms are treated as well.
Show authors, comments, and common names
Trilobita
 Proetida - Otarionidae
Otarion (Maurotarion) cf. dereimsi
 Phacopida - Calmoniidae
Calmoniidae indet., Kozlowskiaspis (Romanops) australis n. subgen., Tarijactinoides jarcasensis, Deltacephalaspis (Prestalia) tumida n. gen. n. subgen. n. sp., "Bainella (Belenops) insolita n. subgen." = Anchiopella
Calmoniidae indet. Delo 1935 trilobite
sp. indet. A
Deltacephalaspis (Prestalia) tumida n. gen. n. subgen. n. sp. trilobite
"Bainella (Belenops) insolita n. subgen." = Anchiopella trilobite
 Phacopida - Homalonotidae
"Burmeisteria" sp.
"Burmeisteria" sp. Salter 1865 trilobite
"Burmeisteria s.l."