Sedimentary Structures “Strata” on Mars (2004). Stratafication Bedding (1-300 cm) Laminations...
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Transcript of Sedimentary Structures “Strata” on Mars (2004). Stratafication Bedding (1-300 cm) Laminations...
Sedimentary Structures
“Strata” on Mars (2004)
Stratafication
Bedding (1-300 cm)
Laminations (<1 cm)Massive Strata (>300 cm)
Inter-Bed Structures(within strata)
•Graded Beds•Cross Beds•Soft Sediment Deformation•Dropstones
Outcrop of turbidites, Carboniferous,
northwestern China.
Graded BedsDeath Valley, CA
Cross BedsZion National
Park, UT
Mars - Crossbeds
Soft Sediment Deformation
image credit: Roger Suthren. Bude Formation, Upper Carboniferous, N Cornwall
Dropstones
Norway
Intra-Bed Structures(on the
surface of strata)
•Ripple Marks•Mudcracks•Raindrop Impressions•Flute Marks
Ripple
Marks
Mudcracks
Glacier National Park, MT
Raindrop Impressi
ons
Flute Marks
Fossils
Unaltered Remains(Usually “younger”
fossils)
Amber
Mammoth Hair
2,400yr old Bog Man, Denmark
Subfossil Wood
“Fossilized” Remains
Permineralization
Replacement
Carbonization
Molds and Casts
Cast - Paleozoic Crinoid
Mold - Pennsylvanian Shark’s Jaw
“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.
Trackways and Trails
Fish Fin Marks (Nova Scotia)
Trilobite Trails, New York505 million years old (Cambrian)
Dino Tracks (Connecticut)
Rodent Burrows
Worm Burrows
Middle Silurian, Grimsby Formation, Hamilton, Ontario
Dino Nests
Upper Cretaceous close to KT boundary,Henan province, China
Coprolites
Miocene Mammal (WA)
Cretaceous Hadrosaur (MT)