来自MSN22 天
The Tiny Marine Creature That Became Tennessee's State Fossil
That historical significance is partly why Tennessee decided to make Pterotrigonia thoracica — often referred to as Ptero, for short — its official state fossil (yes, those are a thing).
Yahoo News13 天
Congress urged to reform TVA to improve transparency, decision making
The Tennessee Valley Authority's Cumberland Fossil Plant is located 22 miles southwest of Clarksville, Tennessee. (TVA photo) Congress should reform the Tennessee Valley Authority’s governance and ...