ammonites
Scaphiocoelia Zone trilobites, Gamoneda Fmn., Tarija region (Devonian of Bolivia)

Where: Tarija, Bolivia (21.5° S, 64.0° W: paleocoordinates 66.7° S, 99.9° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Gamoneda Formation, Emsian (409.1 - 391.9 Ma)

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

• member-level stratigraphic resolution

Environment/lithology: marine; micaceous, gray siltstone and burrowed, micaceous, gray sandstone

• Isaacson (ref. 9681) interprets as deeper than Belen and Icla, so this would make it subtidal, BA 2-3.
• From Isaacson (ref. 9681):"...begins with 100 m of siltstone...gray...mica...mudstone interbeds...240 m of sandstone follows, with a minor mudstone unit towards the top...Sst is fine- to med.-gr....gray...mica...planar cross-stratification...mudstone unit...[more sandstone and siltstone...Zoophycos..."

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 36137: authorized by Michael Foote, entered by Michael Foote on 14.01.2004