Laboratory eight dating of rocks fossils and geologic events

The photo below shows: Monterrey diatomite turbidites of Middle 16 Ma to Upper 6 Ma age.

These deposits were laid down in deep cold offshore basins, then compacted, tilted uplifted and eroded near Montaña del Oro State Park near Obispo County California.

_________________________________________________ (1) What stratigraphic principle did you use to determine this relationship?

_____________ ______________________________________________________________________ (1) 2.a. The uppermost contact between the buried red soil and the overlying lava flow varies from less than 10 cm to more than 20 cm thick and it is more intensely red than the underlying soils. ___________________________________________________ (1) 4. Notice the angular brown clasts of basalt in the overlying brown soil.

The next overlying bed represents a new deposit with its own environmental characteristics, flow regime, transport fluid etc.

The soil is developed on a 2.4 m thick columnar jointed brown basalt flow (3) mapped as 7 Ma Rim Basalt near Sedona.

Work through examples in figures 8.1 through 8.9 in the book so that you are able to work out geological events and sequences and infer relative timings for events.

Activity 8.1 Geological Inquiry for Relative Age Dating Stratigraphic layering represents a sequence of geological events.

Every fossil is a time capsule containing a record of events that happened on Earth thousands or millions of years ago.

Michelle cleans and prepares fossils to better expose them for study and display.

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