based on stratigraphic relations near antler peak, of the battle mountains, roberts introduced the term antler orogeny in an abstract as follows: "the earliest orogeny, here named the antler orogeny ... took place during mississippian (?) and early pennsylvanian time." that abstract was followed in 1951 by his geologic map of the antler peak quadrangle in the text of which he described the antler orogeny in detail and somewhat refined its age span: "during the antler orogeny, formations in battle mountain ranging in age from ordovician to mississippian (?) were complexly folded and faulted. as these rocks are unconformably overlain by the battle formation of early pennsylvanian (des moines) age, the orogeny probably took place during the late mississippian. the orogeny may have continued into early pennsylvanian, however, for the coarse conglomerates of the battle formation indicate derivation from a rugged highland area." in a subsequent influential paper, roberts and others adjusted the age of the antler orogeny as follows: "this belt is now known to have been the locus of intense folding and faulting during the antler orogeny in latest devonian or early mississippian time ..." in the same paper the authors established a connection between the antler orogeny and a major thrust fault as follows: "a belt along the 116°-118° meridians—the antler orogenic belt—was the locus of intense folding and faulting that culminated in the roberts mountains thrust fault..." that age range and connection with the roberts mountains thrust were confirmed in a widely quoted paper by silberling and roberts: "during the late devonian or early mississippian ... the antler orogenic belt was intensely folded and faulted, and during mississippian time the roberts mountains thrust sheet was emplaced." the effect of this revision in the age of the orogeny was to exclude the evidence in the antler peak quadrangle cited above for a late mississippian to mid-pennsylvanian age, on which the concept of the antler orogeny originally had been based, and to establish the conventional age of that orogeny as late devonian to early mississippian.