The Great Unconformity in some locations has nearly a billion years of missing time in the rock record. We talk about what it is and new insights on how it formed.

This week the Flannelcasters talk about the Kola Superdeep Borehole - the deepest borehole ever drilled by humans, extended nearly 12 km below the surface of the Earth.

The Flannelcasters talk about the cause of the 1906 San Francisco earthquake, the resulting damage, and positive changes resulting from the earthquake.

In this week's episode the Flannelcasters talk about clastic sedimentary environments. Then they finish up the episode talking about Mars rovers.

This week, the Flannelcasters talk about the 100-year flood and some other topics related to flooding.

The Flannelcasters talk about the end Permian mass extinction - the worst known mass extinction where 90% of the planet's species died off.

It's time for Listener Questions 6! We take your questions and answer them live on the podcast.

In this episode, the Flannelcasters talk about how metamorphic rocks are formed.

We tried something new this episode. In Ep. 101, we randomly picked a topic in a geology textbook for our episode theme.

The Flannelcasters discuss the Chesapeake Bay impact event , which occurred 35 million years ago.