Limestone with fossils of diverse ancient organisms at bank of river Daugava in Koknese, Latvia. August 16, 2014
In the late Devonian period in this territory, which was not far from the open sea, calcium carbonate sediments extensively accumulated and diverse organisms lived, therefore organogenic limestone is one of the most popular rock types in the area of Koknese.
Brachiopods have been dominating, while the fossils of ostracods, snails, clams, and the sea lily are also common.
Less often one can identify the umbellas, residues of problematic organisms, which most likely belong to algae. In some cases, the snail nucleolus has geopetal structure, there are tiny lumps at the bottom together with micritic calcite, and at the top there is clear calcite cement with tile structure.
Limestone with fossils of diverse ancient organisms at bank of river Daugava in Koknese, Latvia. August 16, 2014
In the late Devonian period in this territory, which was not far from the open sea, calcium carbonate sediments extensively accumulated and diverse organisms lived, therefore organogenic limestone is one of the most popular rock types in the area of Koknese.
Brachiopods have been dominating, while the fossils of ostracods, snails, clams, and the sea lily are also common.
Less often one can identify the umbellas, residues of problematic organisms, which most likely belong to algae. In some cases, the snail nucleolus has geopetal structure, there are tiny lumps at the bottom together with micritic calcite, and at the top there is clear calcite cement with tile structure.