GCMD Chronostratigraphic Units Types Keywords

CALYMMIAN

https://gcmd.earthdata.nasa.gov/kms/concept/71103ecc-f291-48d4-a479-c1781850aee2

broader
https://gcmd.earthdata.nasa.gov/kms/concept/17813394-7d77-4d08-857a-d3b045d49600 original
narrower
71103ecc-f291-48d4-a479-c1781850aee2 original
change note
2019-11-13 09:59:04.0 [tstevens] Insert Concept
add broader relation (CALYMMIAN [71103ecc-f291-48d4-a479-c1781850aee2,423313] - MESOPROTEROZOIC [17813394-7d77-4d08-857a-d3b045d49600,423289]);
2019-11-19 08:24:12.0 [tstevens]
insert Definition (id: null
text: The Calymmian Period is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The period is characterised by expansion of existing platform covers, or by new platforms on recently cratonized basements. The supercontinent Columbia broke up during the Calymmian some 1500 Mya.
language code: en);
definition The Calymmian Period is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The period is characterised by expansion of existing platform covers, or by new platforms on recently cratonized basements. The supercontinent Columbia broke up during the Calymmian some 1500 Mya.
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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