The Virtual Petrified Wood Museum.  Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Correlation of Strata

Correlation of Rock Strata

Matching Rock Strata Formed from
Different Locations that were Formed at the Same Time

1. Index Fossils-Used to correlate rock sequences from different locations. Using index fossils it is possible to determine that two different rock types were formed at the same time. Index fossils have the following parameters:

a. Must have lived for a short geologic time span (geologically this could be millions of years).
b. Must have had a wide geographic distribution.
c. Must be easily identified.

2. Volcanic Ash Falls-many volcanoes can erupt explosively leaving a layer of ash over large areas. This rapid geological event can leave a single layer of ash over a large area making time correlation from different areas very accurate.

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