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Show [ 23] 132 Fossil Woods . T here are two specimens of these; one a semi-opalised fragment from Wett mountain, near the S~anish pea~s, the ?t~er a silicious pebble from St. Ana. Neither of t~em .ret am t~ e onginal structure in sufficient perfect ion fo r dete rmmat 10n of Its char_acter by the microscope. Non-fossiliferous rocks. The· most interesting specimens of rocks were the following: 1st. From the canon of Vegas: A fragment of well character- "ized granite, and another o_f mica slate . . . 2d. San Miguel: A reddish de composmg ~ramte . ' 3d. Purgatory valley: A black slate. . . 4th. Canon Infierno : A compact hornblend1c mass, with red specks, probably a trap rock. 5th. West of the Rio Puerco : "A white clay , us.ed for white-washing." . . . This is a calcareous, rather coarse gramed ma ~ s, Wllh occas1onal grains of silicious sand and . pebbles; it . effervesces briskly with acids, and tastes strongly of hme after betng heated by the blowpipe. It contains no po1ythalamia. 6th. Top of little knools near "Rio Vermejo:" In a state of decomposition, but r esemble~ an indurated sand stone. Minerals. · The minerals are mostly of little interest. The ores are not rich in themselves, nor can they be relied upon to determine the value of the mines. The gold ores from "Viejo Real," "Tuer1o," &c., ·consist chiefly, of cellular quartz, discolored by oxide of iron, and rarely showing any particles of gold. The copper ores are chiefly chrysalla and green carbonate of copper. Below are given · the trpe names of some specimens, to which were at ta.ched the labels copied in the first column. 1st. Smoky quartz from Padillas: A nodule of obeidian; fuses easily by the blow-pipe . . 2d. Salt .from the Laguna near Chilile: Two layers, one of chlonde of sodium, the other of !'ulphate of magnesia. · 1 .3d. Blossom of the gold, Tuerto : Quartz in small elongated pnsms. · 4th. From between Rito and Rio Puerco: A nodule of white compact gypsum. 5th. From between Poblazon and Ciboletta.: Small plates of !elenite . . ~t~. Belen abundant in all the sierras: Handsome plates of s1hmte. 7~h. Fossil moss from the gold mine at "Viej 0 Real:" Dendris 1nfiltntions of oxide of iron. \ |