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Quantitative Biostratigraphy - Quantitative methods applied to solve biostratigraphic problems and to estimate stratigraphic ranges of fossil taxa. Methods of quantitative stratigraphy combine mathematical logic (e.g. statistic analyses) with stratigraphic principles (e.g., law of superposition of strata; speciation, possible acme, and extinction of taxa) allowing the user to retain full control over input and results. Conventional biostratigraphy often lacks direct integration between individual microfossil groups, and rarely gives insight in the actual geographic distributions of taxa and zones. Conventional methods are also poorly suited to integrate records in zonation, and lack a standardized recording and retrieval procedure.
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INTRODUCTION
BIOSTRATIGRAPHIC REVIEWS
INTRODUCTION Stratigraphic situation where the very first occurrence of a species is a localized event in a basin. with widespread migration at a later time, forming a potential correlation surface. The average first-occurrence surface is modelled by probabilistic stratigraphic methods, the very first occurrence by deterministic ones (after Hood, 1995).
BASIC CONCEPT
local versus regional ranges Diagram 2A: Theoretical example showing distributions in space and time of seven different taxa with true chronological succession
BASIC CONCEPT
Diagram 2B: Corresponding sedimentary record of biological events in four stratigraphic sections. Distortions can be attributed to differential role of sedimentation (from Davaud, 1982).
INTRODUCTION, CORRELATION
INTRODUCTION, CORRELATION