Also known as Exsulans Limestone, Olea rivulet, Bornholm, Denmark - Berg-Madsen 1986

Where: Denmark (55.3° N, 15.0° E: paleocoordinates 43.1° S, 27.9° W)

• local area-level geographic resolution

When: Ptychagnostus gibbus + Tomagnostus fissus trilobite zone, Exsulans Limestone Formation, Solvan (510.2 - 504.5 Ma)

• Ptychagnostus gibbus and lowermost part of the Tomagnostus fissus Subzone of the Ptychagnostus atavus. The total thickness of the formation at the collection site is 0.15 and 0.25m, and is equivalent to the Kalby marl, exposed at only one place on one fault block and manually exposed in a well drilling of another fault block near Olea and in the core from a test drill by the Geo Survey at Greenland.

• formation-level stratigraphic resolution

Environment/lithology: lithified, glauconitic, pebbly, phosphatic, pyritic limestone

Size class: macrofossils

Preservation: cast, original calcite, original phosphate

Collection methods: chemical, mechanical,

• The Exsulans Limestone has both calcite and phosphatized fragments. Only echinoderms are represented by clacite fragments. They occur in three stages of preservation: 1) calcite, low Mg analogues of original high-Mg calcite. 2) phosphatized calcite. 3) casts in phosphoritic lumps. The morphology of the echinoderms is very advanced with regard to articulation, which has not previously been described in Cambrian cystoids.

Primary reference: V. Berg-Madsen. 1986. Middle Cambrian cystoid (sensu lato) stem columnals from Bornholm, Denmark. Lethaia 19(1):67-80 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 9875: authorized by Mark Patzkowsky, entered by Phil Borkow on 29.01.2001

Creative Commons license: CC BY (attribution)