Comparative Trends in Evolution Across Correlated Geological Strata

摘要: While many Devonian correlated stratigraphic units are yet to be tested for species evolution, the middle Hamilton Group and Traverse have been studied investigate same. Fossil brachiopods were used as tools that allowed close investigation of evolutionary response these across strata in Eastern America. Results show their patterns uncoordinated nature. Thus, this study reveals brachiopod lineages do not seem match at regional scale United States. Abrupt change was noted upper Michigan samples from lower ones. This could interpreted origin a new species, either environmental selection pressure or by an immigration event. Comparison Basin sections with contemporary Appalachian suggests linked Morphologies uppermost sudden deviation lowermost units, unlike where morphological overlap prominent between units. trend fossil lineage appears local scope. Other like Silica Shale Ohio Arkona Ontario evolution.