Sedimentary Rocks: Earth’s Surface Veneer Sedimentary Rocks2.pdfSedimentary Rocks in New York...
Transcript of Sedimentary Rocks: Earth’s Surface Veneer Sedimentary Rocks2.pdfSedimentary Rocks in New York...
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Sedimentary Rocks:
Earth’s Surface Veneer
Regents Earth Science
With Ms. Connery
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What’s the bedrock
material that’s
mostly found at the
surface in NYS?
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Taughannock Falls
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Enfield Falls, Ithaca, NY
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Allegheny Plateau, Oneida NY
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Guatemala
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Conglomerate in the Catskills
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Don’t forget that organisms also get included in
sedimentary rocks when they die and fall to the
ocean floor!
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General Characteristics of
Sedimentary Rocks• Flat layers that cover large areas
• Sediments of minerals, rocks, or organic
material cemented back together (kind of like
bricks!).
• Frequently look “muddy”
• Fossils are mostly found in sedimentary rocks
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SEDIMENTS COME
FROM THE LAND
and get DEPOSITED
IN OCEANS!
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Alps
Alaska Range
Brooks Range
Where is all that sediment coming from today?
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Follow the rock cycle…What does
uplift weathering erosion
deposition burial compaction
dewatering cementation mean?
WEATHERING
& EROSION DEPOSITION
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Follow the rock cycle…What does
uplift weathering erosion
deposition burial compaction
dewatering cementation mean?
P
R
E
S
S
U
R
E
The loose sediments get
cemented & compacted together
from all the weight of what’s on
top of them to form
sedimentary rock!
WEATHERING
& EROSION DEPOSITION
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We use models to represent the rock layers
and show their characteristics. What would
that model look like?
Rock layer Rock Name Environment
(water speed)
Notes
Model Title - Model Outcrop of Sedimentary Bedrock
Type of model? __________________________
View? ___________________
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CLASTICS (made of rock fragments)
NON-CLASTICS
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CLASTICS (made of rock fragments)
NON-CLASTICS
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Remember - the
speed of the water
sorts the sediment
by size.
So you can tell the
environment in
which the rock
formed based on
the size!
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Use the texture to determine the
kind of environments that
formed the sedimentary rocks.
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Fossils are one of the best things about
Sedimentary Rocks in New York State
Look at the samples and find three fossils that you think
you can identify using the resources provided.
Draw the three fossils in your notebook the way they show
up in the rock
Label each fossil with the genus (main category) and
species (individual) names
Note if it is a cast or a mold
Note the type of sedimentary rock the fossil is in (is it
sandstone, siltstone or shale?)
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Did you see any INDEX FOSSILS (pages 8-9
ESRT) in the samples you saw in class?
How old are the rocks you find them in?
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Of course there’s a geologic time reference table to see what happened when!
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Let’s focus on
the age of the
fossils
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In your notebooks, please…
How do we figure out the range in
ages for divisions of time?
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4
6
5
1
2
8
3
7 9
CORRELATING ROCK LAYERS USING INDEX FOSSILS
We see scattered OUTCROPS in small exposed sections in different locations so we
have to CORRELATE the outcrops to each other to tell Earth’s world-wide
CHRONOLOGICAL history.
INDEX FOSSILS or layers like iridium are a way to do that because they are
widespread and the species only existed for a short time before it went extinct
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Devonian Rock
Formation Name General Description of the Rock Formation
Sherburne Shale Shale at bottom with increasing sand toward top
Geneseo Shale Black shale, about 10 meters thick
Tully Limestone Limestone, about 3 meters thick
Moscow Shale Shale with limestone base, about 15 meters thick
Ludlowville shale Shale, about 25 meters thick
Skaneateles Shale Shale with limestone cap, about 28 meters thick
Marcellus Shale Mostly shale, black at base, then thin limestone, and 4
meters of limestone at top, about 25 meters thick
Onondaga Limestone Highly fossiliferous limestone, over 25 meters thick
Oriskany Sandstone Thin quartz sandstone, about 1.2 meters thick
Manlius Limestone Finely layered limestone about 7.6 meters thick
Rondout Dolostone Dolostone about 7.5 meters thick
Correlating Finger Lakes Rock Layers
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Follow the ESRT - Clastic Sedimentary Rocks
are identified based on the sediment size & shape
Sandstone (sand size) Conglomerate
(mixed sizes and rounded)
Shale (clay size)
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NON-CLASTICS
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NON-CLASTICS
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Conglomerate (mixed sizes and rounded)
Unsorted Clastic
Sedimentary Rocks
Breccia (mixed sizes and angular)
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NO
NC
LA
ST
IC
NON-CLASTICS
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NO
NC
LA
ST
IC
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LIMESTONE - non-clastic sedimentary rock
that can be organically or chemically formed
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Other non-clastic
sedimentary rocks
Coal
Rock Gypsum Dolomite
Rock Salt
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Nova Science
NOW:
Secrets in
the Salt
Chemically formed non-clastic
sedimentary rocks relate to minerals
dissolved in solutions
FIND LINK
ON
WEBSITE!
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Here’s how chemical
precipitates and evaporites form
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If you increase the concentration of
dissolved minerals in the water by:
1. Evaporating (removing) water, or
2. Changing the temp or pH chemistry of
the water
Then the minerals will crystallize
because they can’t stay dissolved
when the solution is supersaturated!!
Why is gargling with warm
saltwater a good example?
How do chemical evaporites &
precipitates form?
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Lets’ ID some
SEDIMENTARY
ROCKS – Lab 17
Need your ESRTs!
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Another thing about sedimentary rocks is
the fossils. How many Index Fossils (pages
8-9 ESRT) you can find in the samples you
see in class?
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This is your key