Also known as Kalby marl, Laesa rivulet

Where: Denmark (55.0° N, 14.9° E: paleocoordinates 43.1° S, 28.9° W)

• local area-level geographic resolution

When: Ptychagnostus gibbus + Tomagnostus fissus trilobite zone, Kalby marl Formation, Amgan (510.2 - 504.5 Ma)

• The average thickness of the formation is 0.2m, regarded as a weathered delithified former Exsulans Limestone exposed at only one place on one fault block.

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•Was Solvan-Menevian, but Amgan works best for the zones (PJW). Phytagnostus gibbus and the lowermost part of the Tomagnostus fissus Subzone of the Ptychagnostus atavus

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, glauconitic, phosphatic, pyritic, calcareous sandstone and lithified siltstone

Size classes: macrofossils, mesofossils

Preservation: cast, original calcite, original phosphate

Collection methods: chemical, mechanical,

• Kalby marl has calcitic preservation in the lower portion of the unit and phosphatized to the top. 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 9876: authorized by Mark Patzkowsky, entered by Phil Borkow on 29.01.2001, edited by Pete Wagner

Creative Commons license: CC BY (attribution)