For the past seven years CLAYTON ESHLEMAN has been doing research on what he calls "paleolithic imagination and the construction of the under-world." First fruits of that work are Hades in Manganese (Black Sparrow Press, 1981), and a set of poems done in the French Dordogne in the fall of 1980, from which these three pieces come. A long poem, Visions of the Fathers of Lascaux, will be published this fall by Cadmus Editions.