- 
48 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
P. Spilosite. Contains quartz, feldspar, actinolite, and epidote. 
Analyses O and P by H. N. Stokes, record No. 1617. These three rocks are contact 
derivatives of the Mansfield clay slate, q. v. 
3. KEWEENAW POINT, MICHIGAN. 
Analyses made by G. Steiger for A. N. Winchell, who has published them in Jour. 
Geology, vol. 16, p. 772, but without detailed description of the rocks. 
A. Olivine diabase, Greenstone Cliff. Auvergnose. 
B. ‘“‘Ashbed” diabase, bed 65, Eagle River section. Camptonose. 
AS B 
BOG: sins stessteneteredoenecies seramiere aWeinis mileinreialhraimeinaniea sel sieisiaela a slopes nates MoaiNa Relates cena 47.69 50. 07 
BATS OGS ster 2 cisrecere taislarassata seen. t ss sist akaurereieceriancioe eecata ele Zioiere rp ialacenefeISRnouane ee gee ion ae 16. 02 12. 63 
09 O8 scenes eewesiep wisio traci ats eeiliry- carer nares erode aietw alias wie etelnie eetnye lone niniata vere cm 2.41 3.84 
BHeO\. ocitragaeseoearenesctents 24 a ENR cee eee ERIng RE REET ES REE MEE YEMEN 8.70 10. 30 
M2 Os secon teenie be meorerasy cece innes G asaad BESS Pee MR CNN ER comecenniects 8.31 5. 23 
CaO eset Sh Ret a Mit Scag nines wine RS RIm RHE aRNEETNS 10. 54 6. 55 
SIND OS ices Aha ta cetacean tere Bini ahy aie danas anaa dha tse pee dysrevt esters 2. 44 3. 53 
TN ahaa eeepc AON dap ela laga te tgcilen UE h yh geterageaah. joie) ass] stnlesttaoroeaTSatelateiae Rae Sorat -| mone 1.90 
Fs OPA MS as se cchmsencasyetus saci seserasse shesaotee SensSncsh20ls sire ays lay SaaS careufull aco aed taed Sea ee . «44 . 86 
EMO ADOVe MOS... st8 atid teh wicuansasneanae sa odabeeeu akong naa Ss ewenieeiers -| 2.04 1.96 
1A) 9 ccs caps vau i accecnarstn bare eso beae Gaerne aoe amae sme wemne Me ee MeaEmiaeaEme aS meer 2 1.38 2. 50 
Pg casa sc3ie rare wistnverascetarererar ca a atria etereranavensin (aes ova aca winwiata tiaras ministerstover a ata araictayenatens 06 22 
MNO asco sx ee micieecessanticeniesm ane 2 > nie ceimayate mdiansialetonarshas mths erciataareadanctancials we aexaleracisienatare +26 42 
BOO sen ceaisiascrepacciaieventinsarcianictortne eiaveraista ratte eve etbu ats ate ince a sisi grbeiectaehislnwrse TERS aN none 02 
100.29 | 100.03 
ZrOo, CO», 8, SOs, and SrO absent. 
4. MENOMINEE RIVER. 
STURGEON FALLS GABBRO. 
From Sturgeon Falls, Menominee River, sec. 27, T. 39 N., R. 29 W., Michigan. 
Described by Williams, Bull. 62, p. 67. 
A. Saussurite gabbro. Awvergnose. Contains plagioclase, almost wholly altered 
to saussurite, diallage, hornblende, and ilmenite, with quartz, calcite, and chlorite as 
alteration products. P. R. C. 1755. 
B. The same, altered and somewhat schistose. Feldspar much altered into calcite, 
with secondary quartz and sericite; pyroxene and hornblende changed to chlorite. 
Leucoxene common. 
