Smithsonian miscellaneous collections . ?-. ^ rt o U ra o rt m o fc ^~^ .4_i ^ ; ^ ^bC s Uh CO ?—^ , •-r; rt .^ U CTj :: CQ l»i» ?;:; ctf am .^j- o -5 J^Mj «l ja rt * % 03 03 —. aCj-Ti ::i f; •p 03 ^£ > ^^ o *-?-» TI? <u z: ^ O O 1—. 03 ^ zz ~ rt Ben 2^ rt ^ rH .—- -Z^ 2^ be 5 -C -t3 4J U _i . ..» ,. / . ? V 1, •-? SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121, NO. 1, PL. 5. -^Ul Uh -c 52 m-B c7 ;fc NO. I GEOLOGY OF THE SAN JON SITE—JUDSON I9 40 feet thick. The equivalent reddish alluvium to the south may besomewhat thicker. Although exposures do not exist because themodern arroyos do n
Smithsonian miscellaneous collections . ?-. ^ rt o U ra o rt m o fc ^~^ .4_i ^ ; ^ ^bC s Uh CO ?—^ , •-r; rt .^ U CTj :: CQ l»i» ?;:; ctf am .^j- o -5 J^Mj «l ja rt * % 03 03 —. aCj-Ti ::i f; •p 03 ^£ > ^^ o *-?-» TI? <u z: ^ O O 1—. 03 ^ zz ~ rt Ben 2^ rt ^ rH .—- -Z^ 2^ be 5 -C -t3 4J U _i . ..» ,. / . ? V 1, •-? SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121, NO. 1, PL. 5. -^Ul Uh -c 52 m-B c7 ;fc NO. I GEOLOGY OF THE SAN JON SITE—JUDSON I9 40 feet thick. The equivalent reddish alluvium to the south may besomewhat thicker. Although exposures do not exist because themodern arroyos do not cut to the extreme southern edges of thebasin, the San Jon formation presumably thins to nothing in thisdirection. Near the center of the depression the first deposit of zone i is alayer of limonite and manganese oxide. It varies from a paper-thinfilm to a crust of botryoidal, crystalline iron-manganese oxide 2 to 6inches thick but in a few places reaches 3 feet in thickness. Over itlies a bleached gray-white sand with layers of red and green clay atthe top. This zone is in places 4 feet thick but elsewhere is to the south the crust and the bleached sand grade into,and are replaced by, 5 to 8 feet of reddish laminated clay and zone is stained to a greenish tint by green clay films whichoccupy strong vertical joints in the clay, and near the
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
