Dolomite limestone and shells whit sea urchins
Who among us has never walked along the beach looking for shells? Sometimes there are areas on the beach where there are more shells than sand.
The more curious among us will have bent down to take a closer look at these accumulations of shells, and will have discovered that for every large shell that catches our attention when weare standing up, there are tens or hundreds of smaller
The shells have very different and complex shapes, and once sectioned they become unrecognisable to the untrained eye. In this photo you can see some bivalves, gastropods (snails),
sea urchins and brachiopods, together with granules of calcium carbonate, none bigger than a couple of millimetres.
|Classification:||Chemical sedimentary rock, oolitic-bioclastic grainstone|
|Mineral composition:||Calcite, Dolomite|
|Fossils:||Bivalves, gastropods, crinoids, brachiopods|
|Location:||Dibona refuse (46°32’1.61″N 12°4’18.87″E)|
|Era:||Lower Carnian (approximately 235 million years ago)|
|Depositional environment:||Carbonate substructure|