Lower Alum Shale, Lower 30 cm (Cambrian of Denmark)

Where: Bornholm, Denmark (55.0° N, 15.0° E: paleocoordinates 43.2° S, 28.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Paradoxides paradoxissimus trilobite zone, Lower Alum Shale Formation, Menevian (513.0 - 501.0 Ma)

• Listed as Middle Menevian.Ptychagnostus punctuosus (and uppermost Hypagnostus parvifrons) trilobite subzones; Paradoxides paradoxissimus zone. Lower 30 cm

• formation-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, gray shale

• Illite clay. From entire formation, a total of 800 g collected at 10 cm intervals, totalling >400 specimens
• Fissile, dark gray shale, slightly metamorphosed

Size classes: macrofossils, mesofossils

Primary reference: V. Berg-Madsen. 1985. The Middle Cambrian of Bornholm, Denmark: A stratigraphical revision of the Lower Alum Shale and associated anthraconites. Geologiska Föreningens I Stockholm Förhandlingar 106:357-376 [P. Novack-Gottshall/P. Hearn]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75946: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 06.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• Ptychagnostus punctuosus (and uppermost Hypagnostus parvifrons) trilobite subzones; Paradoxides paradoxissimus zone; although several localities, treating as pooled samples due to narrow stratigraphic interval
Trilobita
 Corynexochida - Corynexochidae
Corynexochus sp. Angelin 1854 trilobite
 Agnostida - Peronopsidae
 Agnostida - Diplagnostidae
Diplagnostus planicauda Angelin 1851 trilobite
 Agnostida - Spinagnostidae
Hypagnostus parvifrons Linnarsson 1869 trilobite
"subsp. indet."
Hypagnostus parvifrons Linnarsson 1869 trilobite
"cicatricosus"
 Agnostida - Ptychagnostidae
Ptychagnostus punctuosus Angelin 1851 trilobite
"punctuosus"
Ptychagnostus punctuosus Angelin 1851 trilobite
"subsp. indet."
 Redlichiida - Paradoxididae
Paradoxides paradoxissimus Wahlenberg 1821 trilobite
Hyolitha
 Hyolithida -
Hyolithida indet. Mathew 1962
Lingulata
 Acrotretida - Acrotretidae
Acrotreta sp. Kutorga 1848
 Lingulida - Obolidae
Lingulella sp. Salter 1866
 Lingulida - Acrothelidae
Acrothele sp. Linnarsson 1876
Paterinata
 Paterinida - Paterinidae
Dictyonina sp. Cooper 1942
Conodonta
  -
Conodonta indet. Eichenberg 1930 conodont
unclassified
  -
Hexactinellida
 Reticulosa - Protospongiidae
Protospongia fenestrata Salter 1864 glass sponge