GEOL 103 Lecture Notes - Lecture 11: Gnathostomata, Carboniferous, Devonian
30 May 2018
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Department
Course
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1
GEOL 103
Spring 2018 AEC Notes
Prof: Davis
5/7/18 (Week 6, Class #11) Monday
● Goals of class today:
○ Cover the major evolutionary events of the Paleozoic
○ Put what we know about the
carbon cycle into context
● How do we come up with these sections
of time?
○ Mass extinctions
○ Dramatic changes unlike any
previously recorded
○ Events
○ Strata (Rocks we find)
● 1st time period: Cambrian Period (541-485 Ma)
○ Evolutionary arms race
■ Hard parts
■ Predator prey interactions
○ Burgess Shale
■ Lagerstätte
● Site of exponential (...)
find more resources at oneclass.com
find more resources at oneclass.com
2
● Ordovician Period (485-443 Ma)
○ Oea life ↑
○ Early jawless fish, etc.
○ Something happening in sediments…
■ stromatolites and deposits, tracks
○ Bioturbation
■ Animals have ability to dig into sediment
■ Worms and digging critters
■ Ocean floor is being mixed at a faster rate
■ RIP Stromatolites
● → First Mass Etitio
○ Glaciation as all the continents move to bottom of the earth
○ A consequence of glaciation
○ Diversity decreases
● iClicker: What lead to the decline of Stromatolites?
○ Bioturbation of the ocean floor
● Silurian Period (443-419 Ma)
○ Base of ocean, giant sea scorpions, Ocean life becomes more
complex, crinoids, complex top predators
○ Plants make it to land!
■ First land plants, simple (mosses)
● Need water to reproduce, not a lot of structure, don’t get
very large
○ First Jawed Fish!
■ Climatius
■ Paired fins
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Cover the major evolutionary events of the paleozoic. Put what we know about the carbon cycle into context. 1st time period: cambrian period (541-485 ma) Animals have ability to dig into sediment. Ocean floor is being mixed at a faster rate. Glaciation as all the continents move to bottom of the earth. Base of ocean, giant sea scorpions, ocean life becomes more complex, crinoids, complex top predators. Need water to reproduce, not a lot of structure, don"t get very large. Ja(cid:449) eat (cid:271)igger, tougher/hard parts, (cid:373)ore di(cid:448)erse diet (cid:894)(cid:271)ig evolutionary step) Still some jawless, boney plates and hard parts (teeth) for defense. To be on land and be bigger, had to develop a way to transport water around plant body (against gravity) and keep self upright/supported with structure. Very small pants and now (fossils found of ) 8ft tall fungus (not trees!) Orga(cid:374)i(cid:272) (cid:373)atter o(cid:374) la(cid:374)d di(cid:448)ersifi(cid:272)atio(cid:374), larger orga(cid:374)is(cid:373)s. Eyelids, getting water to body, swim bladders, lungs.
