1.6" Eocene Fossil Balloon Vine (Cardiospermum) Leaf - Utah

This is a fossil ballon vine (Cardiospermum coloradensis leaf, collected from the Eocene-aged Green River Formation of Utah. The dark brown preservation contrasts nicely against light brown-grey rock.

It comes the Green River Formation in Uintah County, Utah. This is the same formation that's famous for producing well preserved fish fossils, but a different member and location.