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Selection
of Fossil Foraminifera isolated from Chalk.
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Gumbelina
sp.
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Globigerinella
spp.
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Anomalina
sp.
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Virgulina
sp.
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Chalk is a soft white rock that was deposited between 146 and 65 million years ago during the Cretaceous period. Much if it consists of the fossil remains of microscopic organisms, in particular foraminifera, present in the fauna of the warm seas around the world. A piece of Chalk, the size of a large Walnut, may contain countless fossils and keep the intrepid micro-fossil hunter occupied for months.
Foramina judii (Andrews)
The presence of micro-fossils similar to these is used by the oil industry as an indicator of oil-bearing strata when making exploratory bore holes.
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