Don't Panic Geocast

Episode 5 - "We actually don't call it the Tertiary anymore"

February 20th, 2015

This week we discuss the geologic time scale, meteorites, and fitness trackers!

Pittsburgh Fireball Feb. 17, 2015

Geologic Time-it’s really big (and deep)

How do we begin to define Geologic time?

  • International Commission on Stratigraphy: “ International Geologic Time Scale; thus setting global standards for the fundamental scale for expressing the history of the Earth”
  • We have to have a baseline so that we can all talk about the “same” rocks across the world

Age-dating rocks

  • Many techniques, and the actual dates between our epochs change all the time as our age-dating techniques evolve
  • Many periods/eras/epochs are marked by “catastrophic” occurrences, hence making them natural boundaries, but the dates change.
  • 5 major extinction events

Time as an arrow v. time as a cycle

  • Catastrophism vs. uniformitarianism and gradualism
  • Constantly evolving and vastly interesting
  • Thinking about the definitions of time and how we as humans try to grasp the enormity of geologic time in particular is humbling.

Fun Paper Friday