go FieELD CoLUuMBIAN MuseuM—GEOLOGY, VOL. III. 
b. RODEO GROUP 
The nickel-cobalt content is somewhat higher than in the Pram- 


Name. Fe. | Ni. | Co. | Cu.|-Cr.| P. | So >| C25) Gia eteMicem 
Wit Bicla eects etsy ok aimee Ces i Aeteve fmol he Mages <A a b> 39 06 | .02 2) ae 
IDGarsaC reek o. hast 33 -OO|TH, 001 tyes: latieah. ayers 
OueSa fees ante en 87,..97|10.75|1.07 | sO4].s..))  LQ7) tte, | auctor) asin ee Aerie Ce 
ROdE0t i. are tee 06 -OS/11 2711.20 >|". Ob Oa) aes OL | 05 0) Glsenel aa SOT aa ae 
bee Wart ae Ae 89, 84) =B:A79}. «205 207] we. Peso .O2 | [O05] sy'ticaate treats eet re comm 
53 (EINES T.OC TARE DREE So: 
Width of lamelle not exceeding o.2 mm. The nickel-cobalt 
content lies, as a rule, between 10 and 15 percent. Plessite strongly 
developed. Cohen divides the class imto two groups, the Salt River 








group and the Tazewell group. . 
SALT 
Name. Fes (Ni. | Co; {| Caehicr. | Peas, C. | Si J Ghd Ts Mouiaeet 
Bacubiritor. <2... 2. 88:04) O2OSp 421912 sete AT'S! ) OOS apo eee eat ie A Fite ee oes 
se a ete ides 89.54 9.40} .98.} .02) .02]. 12.) 102°) som eee .o2 |....|Chrom 
Baltintoo 2 sri sw. 89-34) 9:87|..60°| .06].....|  .48°| 103 | 202 70 y ay ieee 
Bee ee RAS AF So. OU S285) 4.74 Pt. Vat ehOr estes tr. | tris eee en 
DUtler aes eet te 44| 89 42/10 :02" 120 a Ol ee oe Do er eee ceed é] nfs ona 
paltsKiverers ateers OO 2744" Oi. FOl vow: Soe oe hd ee eee tr. <)s cigs ieee .26|Mg. N. 
if), PE 46| 90.80) 8:70] .85 + s04}....) ..34 | tr. .02 )s.oe 2) See 
