SNOWBALL EARTH in the American West
**Events may have been canceled or postponed. Please contact the venue to confirm the event.
Date & Time
Sat, May 21 2:00 PM - 3:00 PM
500 N. Fairview Ave.
Goleta Valley Library
SNOWBALL EARTH in the AMERICAN WEST
By Prof. Francis Macdonald, UCSB Dept. of Earth Science
Around 700 million years ago, Earth was covered in ice at least twice, from pole to equator: this is called Earth’s SNOWBALL STATE.
Prof. Macdonald will discuss this state and the Great Unconformity, or gap in our rock record and origin of animals at that time, including proposed models for glaciers and biological evolution of the period.