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What do we use the fossil record for?

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What do we use the fossil record for?. 3. Interpreting past environments. At any one time different sediments types are being deposited in different places. No one environment stretches indefinitely far in any direction. .

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slide1
What do we use the fossil record for?

3. Interpreting past environments

At any one time different sediments types

are being deposited in different places.

No one environment stretches indefinitely

far in any direction.

http://www.geology.ohio-state.edu/~vonfrese/gs100/lect29/xfig29_02.jpg

http://oceanworld.tamu.edu/students/coral/images/coral_reef_1.jpg

http://www.wsgs.uwyo.edu/Coal/coal_brochure/images/fig1_swamp.jpg

slide5
Facies = all of the characteristics of a particular rock unit.

The characteristics of the rock unit come from the depositional environment.

Every depositional environment puts its own distinctive imprint on the sediment,

making a particular facies. Thus, a facies is a distinct kind of rock for that area

or environment.

http://gpc.edu/~pgore/geology/geo102/facies.htm

slide6
A = Sandstone facies (beach environment)B = Shale facies (offshore marine environment)C = Limestone facies (far from sources of terrigenous input)

Each depositional environment grades laterally into other environments.

http://gpc.edu/~pgore/geology/geo102/facies.htm

slide7
http://www3.interscience.wiley.com:8100/legacy/college/levin/0470000201/chap_tutorial/ch12/images/le03_42.jpg
slide8
Transgression

Onlap (Transgressive) Sequences

Shifting Facies through Time

Time Rock Unit

Time Rock Unit

Time Rock Unit

Time Transgressive Unit

Time Rock Unit

Time Rock Unit

Time Rock Unit

Beach

sandstone

Near Shelf

shale

Far Shelf

limestone

Beach moves farther away

Water gets deeper

Sediment becomes finer

FUS – Fining Upward Sequence

= Transgressive Sequence

slide9
Prograding Regression

Offlap (Regressive) Sequences

Shifting Facies through Time

Time Transgressive Rock Unit

Beach

sandstone

Time Rock Unit

Time Rock Unit

Time Rock Unit

Time Rock Unit

Time Rock Unit

Near Shelf

shale

Far Shelf

limestone

Beach moves closer

Water gets shallower

Sediment gets coarser

CUS – Coarsening Upward Sequence

= Regressive Sequence

slide10
Beach

sandstone

Time Transgressive Rock Unit

Near Shelf

shale

Far Shelf

limestone

Beach

sandstone

Prograding Regression

Beach moves farther away

Near Shelf

shale

Water gets deeper

Far Shelf

limestone

Sediment becomes finer

Transgression

Beach moves closer

Water gets shallower

Sediment gets coarser

Transgressive Sequence

Regressive Sequence

slide11
Walther's Law = sedimentary environments that started out side-by-side

will end up overlapping one another over time due to transgressions and regressions.

The result is a vertical sequence of beds. The vertical sequence of facies

Represents former adjacent depositional environments.

Which sequence of rock layers represents a transgression?

http://gpc.edu/~pgore/geology/geo102/facies.htm

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