intro_to_geo_21

intro_to_geo_21 - Geologic time, relative/absolute age...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Geologic time, relative/absolute age cont. Fossil succession and relative age Species originate within geologically brief time frames, few species persist for more than a few million years, and extinction is permanent Fossils that are, for example, uniquely found within Maastrichtian rocks can be used to illustrate temporal equivalence of isolated strata that bear these same fossil assemblages Thus, physically isolated sedimentary sequences can be temporally correlated in the absence of datable igneous intrusions Fossil succession Fossil succession allows relative ages to be produced for many fossiliferous sedimentary rocks regardless of their spatial contexts This allows for temporal correlation of widely separated strata on the basis of fossil content Overlap ranges (last origination–first extinction) for suites of long-ranging fossil species provide maximum constraint upon the ages of the strata that contain them Development of unconformity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

intro_to_geo_21 - Geologic time, relative/absolute age...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online