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Today – 1/25 Critter in the news History of dinosaur discoveries In-class writing Go to the video! Administration: Honors http://ciclops.org Clear / unclear T-chart Biostratigraphy Carbon isotope stratigraphy Magnetostratigraphy An oxygen atom is an oxygen atom because

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today 1 25
Today – 1/25
  • Critter in the news
  • History of dinosaur discoveries
  • In-class writing
clear unclear t chart
Clear / unclear T-chart
  • Biostratigraphy
  • Carbon isotope stratigraphy
  • Magnetostratigraphy
slide6

An oxygen atom is an oxygen atom because

a) it has 8 electrons

b) it has 8 protons

c) it has 8 neutrons

d) all of the above

slide7

In the ID article, Miller is against bringing ID into science classrooms because

a) he thinks it is impossible to believe in God

and evolution at the same time

b) the “theory of gravity” isn’t being tested in

court

c) it is untestable

d) all of the above

slide8

Megalosaurus was so hard to understand (i.e. make a realistic reconstruction of appearance and behavior) because

a) the original fossil material was so fragmentary

b) there was no pre-existing database of well-

understood dinosaur material to compare

it to

c) preconceptions both spiritual and scientific

made it hard to think about something so

radically different from anything alive today

d) all of the above

slide9

In chapter 3 of Gorgon, Roger Smith

a) overturns the conventional thinking that the P-T

boundary was not preserved in the

sedimentary rocks of the Karoo

b) correctly identifies the P-T boundary as the last

appearance of Dicynodon, not the first

appearance of Lystrosaurus

c) realizes that sediments below the boundary layer

were deposited by a large meandering river,

sediments above the boundary layer by braided

streams

d) all of the above

last time
Last time:
  • Magnetostratigraphy
  • Reconstructing dinos from fossils
  • Protoceratops, Megalosaurus, Iguanodon
  • Buckland, Mantell, Owen
  • Steno, Hutton, Lyell, Darwin
taphonomy the study of how fossils get preserved
Taphonomy - the study of how fossils get preserved
  • How sedimentary rock deposits are formed and how dead animals get in them
  • Help us understand ancient ecosystems
  • Helps us understand biases in the fossil record
  • Some organisms and parts of organisms rarely preserved
  • How we make sense of a fossil find – what it does and doesn’t tell us
slide14

www.fossilhut.com

Berlin specimen - 1877

www.sonoma.edu/users/g/geist/bio.html

Solenhofen specimen - 60’s

slide16

www.hayashibara.co.jp/html/shinka/

paleo.cc/paluxy/livptero.htm

Pterodactyluskochi

leute.server.de/frankmuster/P/Pterodactylus.htm

slide17

www.breckminerals.com

www.johnsibbick.com/prehist-pages/pre-p-20.asp

Ichthyosaur from Holzmaden

www.urweltmuseum.de/Englisch/shop_eng/fossilienverkauf_eng.htm

brief history of bird origins debate
Brief history of bird origins debate
  • Archae has teeth, hand claws, and a bony tail like dinos; but feathers like birds
  • 1926 Heilmann decides birds did not descend from dinos because dinos lack wishbones (since found)
  • 1964 Deinonychus discovered
  • 1972 Walker suggests birds descended from an ancestral crocodilian
slide19

Deinonychus

www.dinosoria.com

slide20

Ichnology: study of trace fossils

Connecticut Valley dinosaur tracks described by Edward Hitchcock 1836 - 1858

www.amherst.edu/~pratt

cope s law
Cope’s Law
  • Species in a lineage tend to get larger over time. Certainly not always true, but we will see some spectacular examples of it in this class.
slide26

 Stegosaurus ungulatus

Stegosaurus stenops

www.dinosaursinart.com

slide28

Allosaurus fragilis

www.dinosaursinart.com

dollo s law
Dollo’s Law
  • Law of Irreversible Evolution – species can evolve particular specializations, but can never re-evolve their original condition. First step towards the science of cladistics. Not completely true. For us, when a lineage loses a bone, it does not re-evolve it.
slide31

http://digitalidesigns.net/

Brontosaurus, now called Apatosaurus

slide32

Ornithischia - “bird-hipped”

Saurischia - “lizard-hipped”

slide35

Torosaurus

Pentaceratops

www.amnh.org

www.peabody.yale.edu

www.geo.uw.edu.pl