The 366 daily episodes in 2014 were chronological snapshots of earth history, beginning with the Precambrian in January and on to the Cenozoic in December. You can find them all in the index in the right sidebar. In 2015, the daily episodes for each month were assembled into monthly packages, and a few new episodes were posted. Now, the blog/podcast is on an occasional schedule with diverse topics, and the Facebook Page showcases photos on Mineral Monday and Fossil Friday. Thanks for your interest!

Friday, January 17, 2014

January 15. The Baltic Shield


By Richard I. Gibson

The stable core of Europe is called the Baltic Shield because the Archean rocks that make it up are exposed over much of the Scandinavian Peninsula, Finland, and the area around the Baltic Sea. Like most cratons that are partly covered by younger rocks, the Baltic Shield continues much further in the subsurface. It underlies most of European Russia, where it is called the East European or Russian Platform. Bits of it reach the surface again in Ukraine, in two small areas called the Ukrainian Shield and the Voronezh Arch.

Map derived from U.S. Geological Survey.

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