112-pp22 - UNIVERSITY OF SOUTH ALABAMA Last time we...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 GY 112: Earth History Paleozoic Overview UNIVERSITY OF SOUTH ALABAMA Last time we covered… 1) Eukaryotes (Acritarchs) 2) Metazoans (Ediacarin Fauna) Proterozoic Fossils During the Archean, we saw the rise of the prokaryotes: •Small •No nucleus •DNA spread throughout the cell •Asexual reproduction •Could only be single-celled Proterozoic Fossils During the Proterozoic, something wonderful happens: the rise of the eukaryotes : •Larger (>0.06 mm) •A nucleus and organelles •DNA contained within the nucleus •Sexual reproduction •Could be multi-celled (metazoans) Proterozoic Fossils The first eukaryotes appeared around 2 GA. Arcritarchs were small, single celled silica beasties that floated in the oceans (pelagic). They peaked in abundance at 750 MA and then went away… 0.1mm Proterozoic Fossils They are known as the Ediacarin Fauna And they are found around the world ht p:/ www.cartage.org.lb/en/themes/Sciences ht p:/ www.snowbal earth.org/end.html
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Proterozoic Fossils More likely, severe environmental changes drives evolutionary adaptation. We need bad things to happen in order to evolve. Today’s Agenda The Paleozoic Part 1 1) World Paleogeography 2) Key Tectonic events (web notes 22) Phanerozoic Time Frame Phanerozoic Time Frame
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/04/2012 for the course GLY 112 taught by Professor Haywick during the Spring '12 term at S. Alabama.

Page1 / 6

112-pp22 - UNIVERSITY OF SOUTH ALABAMA Last time we...

This preview shows document pages 1 - 3. Sign up to view the full document.

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