In the geologic column American versionthe Pennsylvanian Period is the sixth period in the Paleozoic era and is characterized in many places by great coal- oil- and gas-bearing deposits. It contains the record of the first reptiles, etc.
The geologic column is like a yearbook with the pictures of all the graduating students in it. No one expects that every one of those students will show up for a particular dance. Neither does the geologist expect that some locality must exhibit all the known strata. The point is that the earth's strata has a dating dr notorious definite chronological order to it, and that order, taken at its most complete, ideal form, serves as an abstract reference frame for defining the actual strata of each locality.
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Back to top Home News U. Dating is a stage of romantic relationships in humans whereby two people meet socially with the aim of each assessing the other's suitability as a prospective partner in an intimate relationship or marriage. It is a form of courtshipconsisting of social activities done by the couple, either alone or with others.