Dates from the lower Cambrian, about 580 million years ago. Algae are one of the oldest continuing forms of life on earth, stretching without interruption from Pre-Cambrian to modern time. Some marine algae, such as this one, secrete or contain high concentrations of lime and have been more responsible for the build-up of coral reefs than the corals themselves. This algae grew in colonies and layers in the sea. You can see in the specimen how it actually formed the rock in the reef. FOSSIL CALCAREOUS ALGEA Cryptozoan proliferun
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