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Habitats - calcareous (726 words) |
 | Calcareous habitats occur around outcrops of calcareous (calcium-rich) bedrock such as limestone, dolomite, and marble. |
| Calcareous fens and their wetland matrices are in delicate balance with their physical, chemical, and biological environments. |
| Calcareous cliffs and talus slopes in the project area occur primarily in the limestone outcrops along the edge of the Allegheny Plateau, such as the Helderberg Escarpment and the Great Vly Wildlife Management Area near the Hudson River in Ulster County, New York. |
| Fossil Groups - Calcareous Nannofossils (948 words) |
| Calcareous nannofossils are fossil remains of golden-brown, single-celled algae that live only in the oceans. |
| A calcareous nannofossil specialist can look at ocean bottom sediment from anywhere in the world that was deposited less than 200 million years ago (one which does contain calcareous nannofossils) and be able to tell you how old that sediment is. |
| Biostratigraphy - Calcareous nannofossils are the most useful age indicator for marine sediments from the Jurassic to the Recent because of their rapid rate of evolution and wide geographic distribution. |
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