158 GEOLOGY OF THE DENTEB LASIX. 



Of Green Mountain, Marvine simply says: 



Below it is also made up of Lignitic strata, while above occur large bowlder 

 beds of rolled volcanic rocks, showing in its northeastern side that it is apparently 

 an extension of the same lava that caps the South Table Mountain 



Marvine apparently ascended Green Mountain from the north and 

 correctly interpreted the angular basaltic blocks of a certain exposure as 

 a remnant of the Table Mountain flow. He erred in considering the worn 

 bowlders of dark andesite as derived from the same source, but had he 

 passed down the western slope of the mountain the key to the problem 

 would probably have been found. 



In 1877 Dr. ( '. A. White visited the region and in his report 1 remarks: 



Search for fossils was prosecuted in the strata of the Table Mountains of this 

 district, which are mainly composed of strata of the Laramie group, and are capped 

 by a trap outflow. In this search I was not successful, although the strata are no 

 doubt equivalent with those [of the Laramie] that were found so fossiliferous in the 

 valleys of Crow and Bijou creeks. 



Prof. Lester F. Ward, paleobotanist of the Geological Survey, spent 

 several days at Golden in August, 1881, studying the geology and collect- 

 ing plants from South Table Mountain. 2 He was accompanied by Dr. C. 

 A. White during a portion of the time. 



The result of Professor Ward's study is given in his "Synopsis of the 

 Laramie Flora." 3 



The first published reference to these beds as distinct from the Laramie 

 is contained in a pamphlet upon the artesian wells of Denver, issued by 

 the Colorado Scientific Society in June, 1884. 4 In this pamphlet,. while 

 discussing the geological relations of the wells, the present writer referred 

 briefly to the "Tertiary andesitic pebble beds" of the country adjacent to 

 Denver on the west, ami shown in Table Mountain, which had previously 

 been classified through their plant remains as Laramie. 



The formation was first described and named by the writer in a paper 

 read before the Colorado Scientific Society in Denver, July 2, 1888. This 



Annual Report of the I'. s. Geol. and Geog. Survey of the Territories for ls77, p. 192. 

 -Third Ann. Rept. ('. S. Geol. Survey, 1883, pp.26-27. 



Mi Ann. Rept. U.S. Geol. Survey, 1885, pp. lu',-557. 

 *The Artesian Wells of Denver— a report by a special committee <<( the Colorado Scientific 

 Society, p. 8. This report was reprinted in Vol. I of the Proceedings of the Society, issued in 1885, 

 p. 79. 



