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2019-11-19 12:52:46.0 [tstevens] Insert Concept
add narrower relation (PENNSYLVANIAN [b99b0ad0-93d2-4acf-912c-13d5a1ba12a6,396505]
- UPPER [5fab652d-b69a-4005-b6cf-6d9d4a533703,423413]);
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2019-11-19 12:52:56.0 [tstevens] Insert Concept
add narrower relation (PENNSYLVANIAN [b99b0ad0-93d2-4acf-912c-13d5a1ba12a6,396505]
- MIDDLE [26d10402-338b-433e-a90e-5952e3ae044d,423417]);
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2019-11-19 12:53:03.0 [tstevens] Insert Concept
add narrower relation (PENNSYLVANIAN [b99b0ad0-93d2-4acf-912c-13d5a1ba12a6,396505]
- LOWER [981c3e53-263e-4a91-a2ca-f5896635bbbd,423421]);
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2019-12-17 09:26:45.0 [tstevens]
insert Definition (id: null
text: The Pennsylvanian is the younger of two subperiods (or upper of two subsystems)
of the Carboniferous Period. It lasted from roughly 323.2 million years ago to 298.9
million years ago. As with most other geochronologic units, the rock beds that define
the Pennsylvanian are well identified, but the exact date of the start and end are
uncertain by a few hundred thousand years.
language code: en);
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