from Mammoth Cave.
Steamboats run from the mouth of the Green river, near Evansville, Indiana, to the Mammoth Cave landing.
It shows few traces of dynamic disturbance, but has been carved, mainly by erosion since the Miocene epoch, into many caverns, of which the Mammoth Cave is the largest.
The natural arch that admits one to Mammoth Cave has a span of 70 ft., and from a ledge above it a cascade leaps 59 ft.
The so-called Mammoth Cave "mummies" (i.e.