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Walk Through Time Talc Dolomite is a sedimentary rock composed largely of calcium magnesium carbonate. This tan dolomite was formed on an ocean floor. It was then intruded by the darker 1.1 billion year old molten diabase which came up through the Earth's crust. This hot intrusion changed the dolomite into talc. Precambrian > Proterozoic eon > Mesoproterozoic era > Stenian period Next > < Previous |
click the photo to return to the tour index Talc, a mineral of great regional economic importance. |
| features - ecology: wildlife - plants - places - region map - map/sat - roads & trails - wilderness - video - aerial - 360 - old west - communities - books - lodging |
| route 66 - ghost towns - gold mines - parks & ... - joshua tree - death valley - mojave preserve - native culture - history - natural features - geology - glossary - comments |
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