1�17 Notes

1ï�¢17 Notes - ition • Distinctive fossils or...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
January 17, 2008 The worst thing about the object that struck earth 65 Ma was: a) its toxic composition b) the site of the impact c) its velocity (correct answer) d) the eruption it caused e) all of the above Lines of Arrested Growth (LAGs) = show age of a dinosaur Found in Bones Similar to tree rings
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
January 17, 2008 Gigantoraptor 26’ long, 11’ at hips, 3000 lbs. Related to Oviraptor, only BIGGER LAGs show age - Gigntoraptor grew extremely fast, died at age 11 Lived 80 Ma Warm or Cold blooded Stratigraphy Study of rock layers Reconstruct ancient environments and the evolution of ancient landscapes Correlate rocks of same are that are widely separated geographically Biostratigraphy, magnetostratigraphy, carbon isotope stratigraphy, absolte dating by radio isotopes. Principle of faunal succession “fossil species succeed each other in a definite and recognizable order” Sedimentary rocks represent time: lower = older, upper = newer (Law of Superpos-
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ition) • Distinctive fossils or assemblages of fossils can be used to correlate widely separ-ated rocks as being the same age. Shelly maine fossils and microfossils, and pol-len are usually best. Lingo • Species: a population of organisms that can interbreed to produce fertile offspring. • Genus: a collection of one or more species (pl. Genera) • Gradualism, uniformitarianism: biological and geological changes happen very slowly through time. 5 major mss extinctions (three of interest): • Permo-triasic, 250 Ma - made way for ancestors of dinos. • End-Triasic, about 200 Ma - took out last of large archosaur competition to the di-nos • K-T, 65 Ma, took out dinos Proposed causes of dino extinction • out-competed by smarter, egg-eating mammals • disease • falling sea level • volcanically driven climate change • astroid strike...
View Full Document

This note was uploaded on 04/03/2008 for the course GEOS 216 taught by Professor Richardthompson during the Spring '08 term at Arizona.

Page1 / 2

1ï�¢17 Notes - ition • Distinctive fossils or...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online