At least three eggs are visible from the outside of the fossil, and Montana State University researchers this week have been studying images taken from a CT scan in search of others inside.
Montana State graduate student Michael Knell says the turtle was probably about a week from laying her eggs when she died and became entombed for millions of years in sandstone.
The fossil was found in 2006 in a remote part of Grand Staircase-Escalante National Monument. The eggs weren't discovered until after it sat in storage for two years and was being re-examined by a volunteer.