RMCNYTGF–calcareous grasslands on spouth exposed slopes of Kyffhaeuer mountain, Germany, Thuringia, Kyffhaeuser, Steinthaleben
RM2DF7872–Fossil foraminifera (Nummulites sp. ) in calcareous rock (limestone). Sample.
RMENF9TT–Calcispongiae (Calcareous sponge), by Ernst Haeckel, 1904 - Editorial use only.
RM2AF25KJ–Mammoth Hot Springs in winter, famous travertine terraces, Calcareous sinter, UNESCO World Heritage, Yellowstone NP, Wyoming, USA.
RMP6TT51–Calcareous skeleton of sea urchin -
RM2BJ35N7–Calcareous stone urn with Chimera. Etruscan culture (3rd-2nd cent. BC) Stone. Catalan coast. Archaeology Museum of Catalonia, Barcelona.
RMP8P1AB–Flowering Pyramidal orchid on calcareous slope
RMBDY0EE–Calcareous tufa spires in Mono Lake, Lee Vining, California, USA
RFEHXW07–Germany, Oberammergau, calcareous grassland with trumpet gentians and creeping buttercups
RMBTECT7–Yellow calcareous sponge off Key Largo coast, Florida, USA
RMBHFBK4–View at waterfall with calcareous sinters, Barranco de los Molinos, Parque Natural de Betancuria, Fuerteventura, Canary Islands,
RMKKREKY–ancient devil's tower at sunrise, Sud Sardinia, Italy. This sighting tower was built in 1639 by the Crown of Spain, and is made of volcanic rock material, andesite and friezes in calcareous sandstone
RFMCACHY–Two species of lichens (white-to-bluish, Acarospora glaucocarpa; black, Staurothele areolata) growing on calcareous sandstone: San Rafael Swell, Utah
RFFC2JEE–The calcareous tufa formation
RFKJN5BX–Fly Orchid 'Ophrys insectifera' grows on calcareous soil,flowers May and June,orchid, vulnerable,Somerset, UK,
RMB56J71–Dropwort Filipendula vulgaris widespread plant of calcareous grassland Also grown in gardens
RFRR6HD1–Mussel shell with natural calcareous tubes made by marine worms, like Pomatoceros species. Found on beach.