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x:1042 <br /> • <br /> relatac '` o, the .rhyalf.te eruptions in the Rosita Hills. Norte <br /> of the• fdrmations cropping out in Nuexfano ?ark ara.,,expos zd <br /> in. t'hks: . .i,�triret. Iles; t.��a the 'smallness of their <br /> P outcrop <br /> e8 s:ix s,.;.eet <br /> ar <br /> t: <br /> s tree tv ta l th `ctasys s' o ']fit <br /> e=.6Mfi ;2100 t. They aye hoc; ...descri,'bed in <br /> % strati;grsrphi.c order. <br /> Bra and Conglomerate <br /> A= thick sequence of interbedded and lenticular,, reworked <br /> and--pyroclasti.c, fine and coarse tuffs! lapi,l.l,i-tuffs, - <br /> breeci,as, and volcanic conglomerates i's exposed in sectior-.s <br /> 5 <br /> 4 and 5y T. 22 S. , R. 72 W. (Trt on plate 2). Where not <br /> faulted, these beds rest unconformably •upon Precambrian mocks <br /> and dip at �4ha l low angles either towards o r.evay from, ti e <br /> contact. V.e beds ,are 'not particularly resistant, arzcl a <br /> Y' <br /> subdued undulating, grass-covered surface with few outcrops <br /> is commonly developed upon totem. <br /> No marker horizons are- ,presett in this unit, and the <br /> variability* of attitude of the reds, even in adjoining out- <br /> t <br /> Crops, does •not allow the presentation of a stratig3ra hie <br /> sectian .or an accurate this ness, ;bWever, the thickness is <br /> a wi.nim-um of 250 feet ,:Ln section 5, T. .22 S. , R. 72 W., -and <br /> the Censer• mine workings .-in Sr.�, 58:C. 16, T 22 S., <br /> R. 72 W. passed -througb a rh.ickness. of la-00 feet of similar <br /> bads, according to Enmns (1896b, p. 454'-W456)I altliough .this <br />