GLY-1842 Lecture Notes - Lecture 15: Stratigraphy, Biostratigraphy, Principle Of Faunal Succession
Document Summary
Oct. 3 dinosaurs of american west brief history. Ongoing science to refine timescale (21st c) Birth of scientific methods - steno - 1600s. 5 this was the original basis for the geologic timescale. Absolute chronology (done by adding numbers so called ) 3 based on radioisotopic dating (eg. carbon dating is a type of this) 5 added to, does not replace, relative timescale. 6 never do carbon dating with dinosaurs steno"s principles. Superposition: oldest on bottom youngest on top. Original horizontality: sed. rocks in horizontal layers. Principle of cross cutting relationships: that which cutes is younger than what it cuts. Inclusions are older than the including rock. 1 fossils of identical form are the same age (skipped slides) biostratigraphy and correlation. Lad (last appearance data) stratigraphical higher, therefore younger materialfad (first appearance data) stratigraphically lowest, therefore oldest index fossils (ex. camerasaurus)
