Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Biostratigraphy: Basics and Biostratigraphic Zones

Biostratigraphy is stratigraphy based on paleontologic aspect of rocks, or stratigraphy with paleontologic methods. The concept of biostratigraphy is based on the observation that organism have undergone successive changes throughout geologic time. Thus, any unit of strata can be dated and characterized by its fossil content. Biostratigraphy is refered as a sub-discipline of sedimentary geology that relies on the zonation of biota, both in time and space, in order to establish the relative stratigraphic position (i.e. older, younger, same age) of sedimentary rocks between different geographic localities. The characterization, separation, differentiation and correlation of rocks unit on the basis of the description and study of their fossils content are called biostratigraphy. This term was proposed by Dollo, in 1904 in a wider sense for the entire research filed in which paleontology exercises a significant influence upon historical geology Stratigraphy based on the paleontologic characteristics of sedimentary rocks is also referred to as stratigraphic paleontology. It is defined as the study of fossils and of their distribution in various geologic formations, emphasizing the stratigraphic relation (time and sequence) of the sediment rocks in which they are contained.