GEOLOGY OP HAMILTON, WARREN AND WASHINGTON COUNTIES 155- 



northwest than otherwise. This trend is pronounced in the north- 

 ern part of the township. In the southern part, near and west 

 of Speculator and near the limestone areas, it is quite variable. 

 The dips are prevailingly southwest and as a rule are flat. But 

 many cases of uncertain dips arise, and in these no record could 

 be obtained. 



Series 2. Two areas of crystalline limestones and associated 

 rocks have Jbeen met. The larger begins a short distance north- 

 west of Speculator and extends 2 miles along the road to Lewey 

 lake. It involves outcrops of crystalline limestone and the pecu- 

 liar types of rock that are often associated with it. No. 154 is. 

 limestone, with a little coccolite and some graphite. It appears 

 in a ledge with pyroxenic rock, and varieties resembling quartz- 

 ites. The limestone extends about half a mile along the highway 

 to the northwest and changes gradually into a more and more 

 silicious variety, which finally becomes a rusty rock represented 

 by no. 155. Under the microscope it is found to be chiefly a clear, 

 colorless pyroxene, with scales of graphite and irregular bits of 

 pyrrhotite and titanite. This pyroxene is a rather characteristic 

 associate of the limestones, and will be mentioned again in con- 

 nection with 153. Specimen 152 is a green rock full of pyrrhotite. 

 In connection with the varieties mentioned there is also a notable 

 development of pegmatites, such as are habitually seen near the 

 limestone areas. Bands of pyrrhotite-gneiss like 152 appear quite 

 frequently, and, while the usual gneisses are present, the former 

 leave a strong impression of being metamorphosed sediments. 

 These peculiar rocks, characteristic of the limestone series, also 

 extend along the road to Whittaker (or Wallula) lake, and they 

 may cover more area than we give them on the map. 



The second exposure was found along the road northeast from 

 Speculator toward Elm lake. Only small outcrops of limestones 

 were seen, but specimen 153 is a graphitic, gneissoid rock, or 

 quartzite, and would therefore appear also to belong to this series. 

 Under the microscope it exhibits quartz, colorless pyroxene, yel- 

 lowish phlogopite, zircons and graphite. Apparently it must 

 have been a somewhat calcareous sandstone or shale before meta- 



