Læså Formation

Læså Formation
Læså Formation
; Stratigraphic range: Lower Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Broens Odde Member, Rispebjerg Member
Overlies	Hardeberga Formation
Thickness	approx. 103 metres (340 ft)
Location
Region	Bornholm
Country	Denmark

The Læså Formation is a lower Cambrian unit exposed on the Baltic island Bornholm, comprising two members: the lower, the Broens Odde Member, colloquially and previously informally termed "green shales" (Grønne Skifre), a 100 m thick glauconitic silt-sandstone occasionally bearing extremely acritarch-rich phosphatic pebbles;^[1] gradually transitioning upwards into the upper, the 3 m thick Rispebjerg Member, a sandstone.^[2]

References

^ Vidal G. 1981. Lower Cambrian acritarch stratigraphy in Scandinavia. GFF. 103:183–192.
^ Clausen C.K., Vilhjálmsson M. 1986. Substrate control of lower Cambrian trace fossils from Bornholm, Denmark. Palaeogeogr. …Palaeoclimatology, Palaeoecol. 56:51–68.

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[1] Vidal G. 1981. Lower Cambrian acritarch stratigraphy in Scandinavia. GFF. 103:183–192.

[2] Clausen C.K., Vilhjálmsson M. 1986. Substrate control of lower Cambrian trace fossils from Bornholm, Denmark. Palaeogeogr. …Palaeoclimatology, Palaeoecol. 56:51–68.

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