Fossil shells

Dolomite limestone and shells whit sea urchins

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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.

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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 

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shells, sometimes measuring only a few millimetres. But not even the most curious – we imagine – would have tried to incorporate a handful of this sand into a solid substance, 

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a glue, a resin, or cement, to then be cut into slices so as to observe the sections of these shells. If you had done this, the result would have been more or less what you see in this photo.

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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),

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 sea urchins and brachiopods, together with granules of calcium carbonate, none bigger than a couple of millimetres.

Name: Limestone Fossilsphere
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)
Formation: Heiligkreuz formation
Era: Lower Carnian (approximately 235 million years ago)
Depositional environment: Carbonate substructure