Download Iguanodon

Today – 1/23
• Critter in the news
• Reading background
• History of dinosaur discoveries
ScienceDaily.com
P-T extinction
Before: simple and complex marine
ecosystems exist in equal numbers
After: complex marine ecosystems
outnumber simple ones 3 to 1
Discovered because of the web and a new
analytical approach
3-point XC opportunity
Tonight, 7:30 pm, Kuiper Space Sciences
308
Surface of Titan, a moon of Saturn
Check in with me before
Sit with me or 1-page summary
Admistration
First short writing assignment comments
Pick up papers in G-S 205
Posting grades
Last time:
River types – meandering vs. braided
Carbon isotopes
K-T impact
P-T scenario
5500 K
The Geodynamo
Mid-Ocean Ridges (MOR’s)
Magnetic Striping of the Sea Floor
MORs and Magnetic Striping
www2.nature.nps.gov/geology/usgsnps/animate
Magnetic striping of the seafloor
Convecting liquid outer core generates
Earth’s magnetic field
Heat from the core and radioactive decay
drives mantle convection and plate tectonics
making new rocks at mid-ocean ridges
New rocks record polarity of Earth’s
magnetic field!
Iceland
Magnetostratigraphy
Drill a bunch of cores going up through
layers
Analyze them to determine the pattern of
magnetic polarity through time
Match them (like tree rings) to the
appropriate part of the known pattern for
Earth throughout time, read off the date
Insert pic of AC
Petrified tree?
AC shot from above! With inset of teeth
What fossils tell us about dinosaurs
How they looked - size, shape, skin
How they behaved - diet, locomotion, social
life, as parents
Physiology - thermal regulation, growth
patterns
History of life - speciation and extinction,
relationships among groups
Environmental reconstruction, rock ages
geochemistry, paleogeography, interaction
between physical and biological worlds
← Griffin
inspired by
Protoceratops?
↓
web.ukonline.co.uk/conker/
www.dinoland.dk
www.oum.ox.ac.uk/geolcoll.htm
1677 – Robert Plot publishes first known
description of a dinosaur bone. However,
he mistakes it for the femur of a giant
human!
www.lhl.lib.mo.us/events_exhib/exhibit/ex_paper_dino.shtml
1815 – William Buckland finds Megalosaurus jaw
1831
home.uchicago.edu/~shburch/dinopaper.html
1830’s – Meet
Meg, plus the
happy water
lizard
1833
1836 – Gideon
Mantell discovers
the teeth of
Iguanodon
www.lhl.lib.mo.us/events_exhib/exhibit/ex_paper_dino.shtml
Iguanodon – notice the sprawling legs
1842 – Richard Owen defines the “Dinosauria”, which
translates as “terrible lizards”
Depiction by Owen circa 1850
Benjamin Waterhouse Hawkins’ 1853 dinosaur reconstructions
being prepared for display in the Crystal Palace, Hyde Park,
London
http://www.ric.edu/rpotter/cryspal.html
www.simondevlin.com
Importance of Hawkins
First attempt at full-scale reconstruction
Super-popularized dinosaurs
Cemented wrong views!
www.owen.k12.ky.us/trt/beverly/Megalosaurus_files/frame.htm
http://www.healthstones.com/dinosaurdata/dinodata.html
Nicholas Steno –
“Father of stratigraphy”
Second half of the 1600’s
Said fossils were remains of organisms
Principle of Original Horizontality – rock
layers laid down horizontally, any deviation
from this due to later disturbance
Law of Superposition – lower layers are
older, upper layers are more recent
Early 1800’s geology comes alive!
1795 – Theory of the Earth by James
Hutton: how rock layers form, hot inside,
old, uniformitarianism, natural selection
1815 – Geologic map by William Smith:
biostratigraphy
1830-1833 – Principles of Geology by
Charles Lyell: stratigraphy
1859: On the Origin of Species by Darwin