Læså Formation

File:Ekkodalen - Læså.jpg

{{Infobox rockunit

| period = Lower Cambrian

| age =

| image =

| imagesize =

| caption =

| type = Geological formation

| prilithology =

| otherlithology =

| unitof =

| subunits = Broens Odde Member, Rispebjerg Member

| underlies =

| overlies = Hardeberga Formation

| thickness = approx. {{Convert|103|m|ft|-1}}

| area =

| map =

| map_caption =

| location =

| coordinates =

| region = Bornholm

| country = {{DEN}}

| extent =

| namedfor =

| namedby =

| year_ts =

| location_ts =

| coordinates_ts =

| paleocoordinates_ts =

| region_ts =

| country_ts =

| thickness_ts =

}}

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;Vidal G. 1981. Lower Cambrian acritarch stratigraphy in Scandinavia. GFF. 103:183–192. gradually transitioning upwards into the upper, the 3 m thick Rispebjerg Member, a sandstone.Clausen C.K., Vilhjálmsson M. 1986. Substrate control of lower Cambrian trace fossils from Bornholm, Denmark. Palaeogeogr. …Palaeoclimatology, Palaeoecol. 56:51–68.