sedimentary structures “strata” on mars (2004). stratafication bedding (1-300 cm) laminations...
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Sedimentary Structures
“Strata” on Mars (2004)
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Stratafication
Bedding (1-300 cm)
Laminations (<1 cm)Massive Strata (>300 cm)
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Inter-Bed Structures(within strata)
•Graded Beds•Cross Beds•Soft Sediment Deformation•Dropstones
Outcrop of turbidites, Carboniferous,
northwestern China.
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Graded BedsDeath Valley, CA
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Cross BedsZion National
Park, UT
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Mars - Crossbeds
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Soft Sediment Deformation
image credit: Roger Suthren. Bude Formation, Upper Carboniferous, N Cornwall
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Dropstones
Norway
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Intra-Bed Structures(on the
surface of strata)
•Ripple Marks•Mudcracks•Raindrop Impressions•Flute Marks
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Ripple
Marks
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Mudcracks
Glacier National Park, MT
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Raindrop Impressi
ons
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Flute Marks
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Fossils
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Unaltered Remains(Usually “younger”
fossils)
Amber
Mammoth Hair
2,400yr old Bog Man, Denmark
Subfossil Wood
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“Fossilized” Remains
Permineralization
Replacement
Carbonization
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Molds and Casts
Cast - Paleozoic Crinoid
Mold - Pennsylvanian Shark’s Jaw
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“Trace Fossils”
Track: an impression made by a single foot. Trackway: a number of tracks made during a single trip. Trail: an impression made by a tail or other “non-foot”.
Burrows: a hole or holes an animal dug into loose sediment (like mud).
Eggs and Nests: shells that at one time would have contained babies and the nests that the babies would have been kept in.
Coprolites: poop that has become fossilized.
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Trackways and Trails
Fish Fin Marks (Nova Scotia)
Trilobite Trails, New York505 million years old (Cambrian)
Dino Tracks (Connecticut)
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Rodent Burrows
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Worm Burrows
Middle Silurian, Grimsby Formation, Hamilton, Ontario
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Dino Nests
Upper Cretaceous close to KT boundary,Henan province, China
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Coprolites
Miocene Mammal (WA)
Cretaceous Hadrosaur (MT)