44 IRON ORES OF IRON SPRINGS DISTRICT, UTAH. 
At Chloride Canyon and elsewhere the limestone contains mineral 
veins near the contact with the lavas. The minerals are mainly 
calcite, barite, and quartz, with subordinate amounts of galena, 
pyrite, chalcopyrite, siderite, limonite, magnetite, and copper car- 
bonates. Gold and silver are reported, the latter probably being 
present in the galena. Similar mineral veins are found in the Home- 
stake limestone, both associated with and away from kon-ore deposits. 
QUATERNARY SYSTEM. 
PLEISTOCENE CONGLOMERATE. 
The Pleistocene conglomerate is exposed only east of Antelope 
Springs, in the northwest corner of the area, where it occupies a 
little embayment in the lava area. To the north it is covered by 
later lake and out wash deposits. In the Pleistocene conglomerate 
area a few exposures of Tertiary limestone and conglomerate were 
noted, but it was not possible to tell whether these were outcrops 
of actually underlying formations or merely huge bowlders partly 
buried. There being no definite proof of the former, these exposures 
were not mapped. The formation is probably present west of The 
Three Peaks, overlying the Cretaceous and overlain by surface 
deposits, but only one outcrop was found and this was too small for 
the scale of the map. 
The conglomerate is composed of both rounded and irregularly 
shaped fragments of limestone, chert, sandstone, and lavas, derived 
from immediately adjacent rock formations and cemented by a 
reddish sandy calcareous material, forming in places a fairly well- 
consolidated rock. It is rather thinly bedded, some of the beds 
being made up of coarse conglomerate, and others of finer sandy 
materials. From the thinly bedded character and rapidly varying 
materials of the different beds it seems clear that the formation is of 
fluviatile or terrestrial origin, deposited by streams as they emerged 
from the mountainous areas. 
The Pleistocene conglomerate is unconformable upon the Tertiary 
lava series, in horizontal beds which retain no evidence of faulting. 
Its thickness is not known, but it is likely not more than 200 feet at 
the most. 
PLEISTOCENE AND RECENT GRAVEL, SAND, AND CLAY. 
Gravel, sand, and clay, derived from the neighboring rock hills, 
cover the lower slopes of the hills and the desert areas as lake, stream, 
and outwash deposits. To the east are the deposits of Rush Lake 
Valley, which run northeastward along the Colob front. To the 
west and north are the deposits of the Escalante Desert, which 
extend 35 or 40 miles westward and far to the north. 
