In addition to frozen animals obtained from Siberia, a large number of fossils preserved in amber has also been discovered in Russia. These come from what's known as Baltic amber, found in a wide area from Berlin in the west to the Ural mountains in the East. The great majority of Baltic amber dates from the Eocene Period (54 to 37 million years ago).
Baltic Ambers (URL) 
Books
Articles
Announcements
