Isotelus2883 Posted 12 hours ago Share Posted 12 hours ago For some times like the Silurian or Cambrian, how would one break it into Upper/middle/lower? Thanks. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted 10 hours ago Share Posted 10 hours ago The ICS, had a chart that lists the series that make up the Cambrian and Ordovician. The age in years is determined by a rock or mineral that is datable by isotopes. The Ordovician is broken into official series that are capitalized Upper, Middle and Lower. The Cambrian is broken into named and capitalized series. https://stratigraphy.org/chart My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Isotelus2883 Posted 10 hours ago Author Share Posted 10 hours ago (edited) I am aware of that, but has the Cambrian been broken up into definite Lower/Middle/Upper or is that subjective? Sorry that my original question was worded unclearly. Edited 10 hours ago by Isotelus2883 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted 9 hours ago Share Posted 9 hours ago The Cambrian is not officially divided into Lower, Middle and Upper per ICS. You could informally use lower case, lower, middle and upper although it might not be clearly defined. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
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