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Skeleton of a Radiolarian Very Greatly Enlarged

Skeleton of a Radiolarian Very Greatly Enlarged.jpg Phororhacos, a Patagonian Giant of the MioceneThumbnailsCephalaspis and Loricaria, an Ancient and a Modern Armored FishPhororhacos, a Patagonian Giant of the MioceneThumbnailsCephalaspis and Loricaria, an Ancient and a Modern Armored FishPhororhacos, a Patagonian Giant of the MioceneThumbnailsCephalaspis and Loricaria, an Ancient and a Modern Armored Fish

The very rocks themselves may consist largely of fossils; chalk, for example, is mainly made up of the disintegrated shells of simple marine animals called foraminifers, and the beautiful flint-like "skeletons" of other small creatures termed radiolarians, minute as they are, have contributed extensively to the formation of some strata.