the saulkalne shelly dolomite rocks with clearly visible fossils platyschisma kircholmiensis

abstract ancient animal bank beach bedrock building closeup collection daugava dolomite dolomitic ecology environment fossilised geological geology holes invertebrate kircholmiensis latvia latvian lime limestone limestones macro material mineral natural nature outdoor pattern phenomenon platyschisma prehistoric river rock rough salaspils sea shelly shore skeleton specimen spiral stone structure sunlight textured