How Does Biochronology Work?

Biochronology thus identifies intervals of geologic time based on fossils. These time-distinctive fossils are the fossils by which zones can be defined, which is to say that any zone represents, or is equivalent to, some interval of geologic time. This interval of time is called a biochron.

What is biostratigraphy and how does it work?

Biostratigraphy is the branch of stratigraphy that uses fossils to establish relative ages of rock and correlate successions of sedimentary rocks within and between depositional basins. A biozone is an interval of geologic strata characterised by certain fossil taxa.

What are the principles of biostratigraphy?

The principles of biostratigraphy stem from the fundamental precept that William Smith claimed to be a general law: “The same strata are found always in the same order of superposition and contain the same peculiar fossils.” The subject can be considered under four headings: (1) biostratigraphic correlation; (2) ...