548 Ex. Doc. No. 4r 



Fossil Woods, 



There are two specimens of these; one a semi-opalised fragment 

 from Wett mountain, near the Spanish peaks, the other a silicious 

 pebble from St. Ana. Neither of them retain the original structure 

 in suflScient perfection for determination of its character by the 

 microscope. • 



jyon'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 of mica slate. 



2d. San Miguel: A reddish decomposing granite. 

 ■3d. Purgatory valley: A black slate. 



. 4th. Canon Infierno: A compact hornblendic mass, with red 

 specks, probably a trap rock. 



5th. \yest of the Rio Puerco: "A white clay, used for white- 

 washing." •> ' . 



This is a calcareous, rather coarse grained mats, with occasional 

 grains of silicious sand and pebbles; it effervesces briskly with 

 acids, and tastes strongly of lime after being heated by the blow- 

 pipe. It contains no polythalamia. 



6th. Top of little knoofs near " Rio Vermejo:". la a state of de- 

 composition, but resembles an indurated sand stone. 



Minerals. 



% 



u " - 



f 



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," " Tuerlo " &c 

 consist chiefly of cellular quartz, discolored by oxide of iron, and 

 rarely showing any particles of gold. The copper ores are chiefly 

 •cbrysalla and green carbonate of copper. Below are given the true 

 names of some specimens, to which were attached 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 Lagunsunear Chilile: Two layers, one of chlo- 

 ride of sodium, the other of sulphate of magnesia. 



3d. Blossom of the gold, Tuerto: Qua?tz in small elongated 

 prisms. 



4th. From between Rito and Rio Puerco: A nodule of white 

 compact gypsum. ^ 



5th. From between Poblazon and Ciboletta: Small plates of 

 «elenite. ^ 



.6th. Belen abundant in all the sierras: Handsome plates of 

 silmite. ^ 



7th. Fossil moss from the gotd mine at '< Viejo Real-" Dendri- 

 € infiltrations of oxide of iron. 



