| Image is courtesy a group that goes by the cybername "blackriverfossils." This is a freshly dug mako shark tooth from the Middle Miocene Round Mountain Silt Member of the Temblor Formation, about 16 to 15 million years old. |
| Image is courtesy a group that goes by the cybername "blackriverfossils." This is a freshly dug mako shark tooth from the Middle Miocene Round Mountain Silt Member of the Temblor Formation, about 16 to 15 million years old. |