ESC2000 Lecture Notes - Lecture 7: Radiocarbon Dating, Nicolas Steno, James Ussher
Document Summary
Development of geologic time scale: relative geo time scale, 1600s irish anglican bishop james ussher. Dates ago of earth based on biblical interpretation. Earth was formed in 4004 bc (6020 yrs. old: james hutton doctor a gentleman farmer . Conformable: a sequence of strata deposited with no breaks. Unconformity: a break in the rock record due to a break in deposition of sediments or due to the erosion of previously deposited sediments = missing time. 3 types: disconformity horizontally bedded strata deposited over horizontally bedded strata, angular deformity c horizontally bedded strata overlying tilted strata, non conformity horizontally bedded strata over met or igneous rock. Correlation the matching up of different rock types in different regions to account for time missing in unconformities. So to correlate from section to section, can use: matching rock type, fossil content. Principle of fossil succession: fossil organisms succeed one another in the geologic record in a definite and determinable order.
