Limestone is made up of organic material, mostly calcium carbonate. The chalk variety is made up of the shells of coccolithophores, small platy animals that stack together and powder easily. Large layers of chalk indicate a low-oxygen environment, most likely the bed of an ancient seafloor. This sample is also available in packs of 12.
Features
- Chalk limestone sample approximately 1″ (3cm) in size
- Chalk is made up of coccolithophores, microscopic fossils composed of calcium carbonate
- Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements
- Great example of a sedimentary rock formed chemically
- Specimen comes in clear labeled and barcoded bag for ideal storage
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