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T 104 t . <br /> the underlyitg zons• (see fig. 24). <br /> Vze.middle zone i* Jess, than 50 feat':Aick, and consists <br /> of numerous Ia a compound spheruti.tes.surroundtid,by:, en- <br /> 7. Ve:lope$ .aU,01Ay...,.(se 1 <br /> 4. <br /> l3 tea .have. + ,�04 311M..di MOteaz,...61 ton fee.t.,bu <br /> commonly two to three ,feet. across. To the preseant� authors s <br /> F <br /> ' knowledge, spherulites of this size have not been found in <br /> other dis trIcts.. The suharu,,,1,f.tes have, light 8t'aY,.'wesxhered, <br /> extar:Wr rin4is;, -,but whai bto:k", open,, they exhibit m+ec i.u:r, <br /> light gray aphani.tLc lenses with a pale red aphsnitir- back. <br /> SMund. The lenses are arranged so that• their 1(,,Agtb <br /> Parallels the original flow-leyerivg rats tier t1han Conforming <br /> 'to the shape of the- Compound spherulito* t;bay must represent <br /> some. textural oar= 'compogttional differ' GrIce,. • Where ,the s;'heru-Y <br /> lites are widely separated, the ci.ay +envelopes may not be <br /> Continuous; and b1ack parlitic tobsidiAA-,,.which forms the <br /> third and i.nwer ash zaxie,: ri11 occupy spaces be •*den the <br /> Clay• zones. It is ob'ri. <br /> oo$. in the field that t1e ..��,�`.t�.��.t�s <br /> and their ctay ,e�a°re3.t�p a are st»emplacement davitt catio.-I <br /> products of. the obsidian; al scx �°.sere sp�a.�rub�.Leis unacoostJL xdied <br /> by C147, -envOlf3pes-Are found In this.fels,it' <br /> i.c zonsi. tiaey Are'' <br /> rievitri fi.ca�Ci ±s prad-.xc s, prc,bab y 9 deut4r�.c arigiri of an <br /> ori.gioal.ly• gla.say roek. • S,irmns (19062") �ha•s described a <br /> s3kni.3afi •srharul.itic zone at the; top•, of a vitrophytiC pc:ttiosx <br />