Late Eif./Give. Loc. 25b: Monte Alegre region, SGMB borehole no. 84 at Itaujuri (Devonian of Brazil)

Where: Para, Brazil (2.0° S, 54.0° W: paleocoordinates 66.7° S, 27.2° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Erere Formation, Givetian (387.7 - 382.7 Ma)

• Collection not explicitly said to come from Erere Fmn., but this seems rather clear from stratigraphic and geographic context. See lithology description

• formation-level stratigraphic resolution

Environment/lithology: marine; micaceous siltstone and shale

• See lithology description.
• "The Erere Formation consists of micaceous siltstones with interbedded shales and sandstones and conformably overlies the Maecuru Fmn. Devonian invertebrates occur in all lithologic types...They are especially abundant in the lower Erere section and support the dominantly Givetian age indicated by microfossils...Along central and northern portions of the Amazon Basin the upper Erere Formation consists of relatively monotonous, laminated dark siltstones..." [radioactive shales also mentioned]

Primary reference: J. H. G. Melo. 1988. The Malvinokaffric realm in the Devonian of Brazil. N. J. McMillan, A. F. Embry, and D. J. Glass, eds. Devonian of the World, Volume I. Canadian Society of Petroleum Geologists. Calgary, Alberta, Canada 669-703 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 37174: authorized by Michael Foote, entered by Michael Foote on 03.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Calmoniidae
Metacryphaeus sp. Reed 1907 trilobite
Bivalvia
 Cardiidia - Sanguinolitidae
""Sphenotus" sp." = Sanguinolites
""Sphenotus" sp." = Sanguinolites M'Coy 1844 clam
 Cardiidia - Grammysiidae
Cimitaria sp. Hall and Whitfield 1869 clam
 Nuculida - Nuculidae
"Nucula" sp. Lamarck 1799 nut clam
 Protobranchia - Malletiidae
Nuculites sp. Conrad 1841 clam
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites sp. von Schlotheim 1820
Strophomenata
 Productida -
"Chonetacea indet." = Chonetoidea
"Chonetacea indet." = Chonetoidea Bronn 1862
"various definite species"
 Orthotetida - Schuchertellidae
Rhynchonellata
 Terebratulida - Meganterididae
 Spiriferida - Mucrospiriferidae
? Mucrospirifer sp. Grabau 1931
"mostly 'Spirifer' pedroanus Rathbun, 1874 and related forms"
 Spiriferida -
? Pustulatia sp. Cooper 1956