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Lecture 1

GSC 102 Lecture Notes - Lecture 1: Petrifaction, Soft Tissue, Ocean


Department
Geological Sciences
Course Code
GSC 102
Professor
ta-shanataylor
Lecture
1

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GSC 102 EVOLUTION OF THE BIOSPHERE
TA-SHANA TAYLOR
For the presentation the references are necessary for the grade, they are
10% more
TENTATIVE SCHEDULE AND BLACKBOARD
What is a fossil?
o Any evidence is any preserved remains, impression, or trace of any
once-living thing from a past geological age.
Fossilization
o Being buried, having things buried are easier or quickly is faster for
that, animals, rain, UV (kills off bacteria, ligaments, tissues, collagen,
etc.), wind, water (corrosive),
Marine environment
o Stacker water (calm water deep water, the calmer the water, also
less animals “more in the shallow ocean)
Four main fossils
o Petrifaction: “to make into stone”
A. Permineralizartion “spread minerals throughout”.
Minerals become deposited in the organisms remains. The
originals composition remains, but is made harder by the
minerals
B. Replacement the original material is dissolved and
replaced by minerals, this can often be very precise and
maintain derails in the fossil
C. Carbonization the soft tissue are preserved as thin films of
carbon (the best)
o Mold and Casts
Mold exterior
Cast exterior
Soft tissue preservation
Soft tissue can be preserved in low oxygen environments
Dryness can also preserve soft tissue
o Soft tissue preservation
o Trace Fossils or Ichnofossils
What kind of things e don’t want to have too much (in the environment)
o Oxygen
o UV
o Water
o Wind

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May 23, 2018
Coprolites (poop)
Burrows
Borings
Taphonomy: Study of the process and events that occur between death and
discovery
Sequence of process Sub-Discipline
Affecting Preservation Of Taphonomy
- Organism dies or sheds
body parts
There is a bias towards preserving marine organisms with high populations
and hard parts
Research questions
o How well does the marine mammal death assemblage reflect the
diversity, species composition, and proportion of bone types in the
living fauna?
o Could bone surveys complement surveys of live animals?
Thursday 24, 2018
HADEAN
o By building the planet is destructive. The gravity is a function od 2
major things.
Hadean Eon (4.5 4.0 / 4.6 billion years ago) is an unofficial eon
Hadean 4,600 4,000 mya (4.6 billion)
o Starts 4.56 billion years ago with the creation of the earth and the
solar system
o Lots of debris in the soar system, gravitational attraction causes
cosmic material to accrete
o Early bombardment

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Hadean and the moon
o We have the “best moon”
o The moon is 4.77 billion years ago
4.5 billion years ago we had a planet called Theia that was like the size of
mars and crash with earth
If we don’t have moon
o Ties not
o Having the moon Will slow down the rotation of earth it creates a
chaotic environment, the faster the planet is spinning the higher and
dangerous are the storms
o Extreme clime change,
Our planet is 23/5 degrees, if we have 0 degrees or ties we
wont have any seasons. (Tills)
The equator gets 6 months of direct sun (spring, fall)
Tropic of cancer 3 months (summer)
Tropic of Capricorn (3 months winter)
North pole (spring equator 12 summer solitur 24h
o The moon doesn’t give us light – however without it without it, the
light of the moon can aids the sexual reproduction on the ocean
Took him 6 years to know the earth age
MAY 30, 2018
http://www.space.com/25579-cosmos-recap-earth-age-lead-poisoning.html
Meteorite U/Pb
o Arizona
o Name: Meteor Crate
Talk about the gods,
o Saturn, the god,
Violent
Leal
Cold
Slowest
Rage
During festivities, no wars, executions, etc
important god
FUN
Plumbing: PB
o : piping
o Sweetens wine
o Coated post/pans
o Malleable
Plumbing is on: paint, light bulbs, shoes, plastic
THE REAL SOURCE IS NOT THE WATER IS THE PIPES
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