The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.The table of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set. acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large. Carboniferous Period, fifth interval of the Paleozoic Era, succeeding the Devonian Period and preceding the Permian Period.In terms of absolute time, the Carboniferous Period began approximately 358.9 million years ago and ended 298.9 million years ago. The following phyla of multicellular animals (called metazoans) are usually included in general biology courses. Remember that the botanical counterpart of a phylum is called a division. Paleoecology (also spelled palaeoecology) is the study of interactions between organisms and/or interactions between organisms and their environments across geologic timescales.As a discipline, paleoecology interacts with, depends on and informs a variety of fields including paleontology, ecology, climatology and biology.. Paleoecology emerged out of the field of paleontology in the 1950s. The Ordovician period was started by an extinction called the Cambrian-Ordovician extinction which lasted about 44.6 million years, and ended with a mass extinction event known as the Ordovician-Silurian extinction event that wiped out approximately 60% of all the marine. Absolute dating A means of estimating the age of rocks with some degree of accuracy using measurements of radioactive isotopes. The table below presents an abbreviated geologic time scale, with times and events germane to this essay. Please refer to a complete geologic time scale when this one seems inadequate. A time line from before writing began to the present, linked to Andrew Roberts' book Social Science History and to other resources. A must-read for anyone who wants to participate in talk.origins. This article lays out the land for evolutionists and creationists alike, presenting the concepts of and the evidence for biological evolution.