120 



SCIENCE. 



[N. S. Vol. XXII. No. 552. 



sum maxillingua (Le Sueur), in the Delaware 

 basin. It may be of interest to know that 

 Exoglossum also occurs east of the Delaware 

 basin. I caught one in 1899, in Peckman's 

 Brook where the Morris Canal, crosses the 

 brook near Little Falls, Passaic' Co., N. J. If 

 Exoglossum is not indigenous to the Passaic 

 basin it may have reached there from the Dela- 

 ware River via Museonetcong River and Lake 

 Hopatcong. This lake is the summit feeder 

 of the Morris Canal. The fish lived for many 

 months in an aquarium. It has the feeding 

 habits of the suckers and remains mostly near 

 the bottom. Eugene Smith. 



HOBOKEN, N. J. 



SPECIAL ARTICLES. 



DISCOVERY OF THE COMANCHE FORMATION IN 

 SOUTHEASTERN COLORADO.' 



During a visit to the Two Butte in Prowers 

 County, Colo., some time ago, I found that a 

 small local uplift east of the butte reveals the 

 Coraanche formation filled with characteristic 

 Gryphoea corrugata. The locality is on the 

 main, or South Butte Creek, four miles west- 

 northwest of the old town of Albany, or five 

 miles east-northeast of the Two Butte. To 

 the east and west the low bluffs in the valley 

 consist of Dakota sandstone rising gently 

 towards the Two Butte laccolith and the gen- 

 eral anticline extending north and south in 

 the southeastern portion of Prowers County. 

 The Comanche beds are exposed just south- 

 west of Mechling's Ranch in a small local 

 anticline and they extend for some distance 

 along the south side of the creek, in low bluffs 

 capped by Tertiary deposits. The lowermost 

 member appearing is a dark shale, more or less 

 sandy, grading upward into a friable, brown 

 sandstone, in part calcareous. The fossils 

 occur in great abundance in the sandstone and 

 sparingly in the dark shale. Owing to over- 

 lap of Tertiary sands and gravels, the precise 

 relation to the Dakota sandstone is not clearly 

 revealed, but it is apparent that the Comanche 

 beds lie a very short distance below the main 

 Dakota ledges appearing to the eastward, al- 



^ Published by permission of the director of the 

 U. S. Geological Survey. 



though probably separated by some dark, non- 

 fossiliferous, sandy shales which lie at the 

 base of the Dakota cliffs in a gorge extending 

 eastward. Probably the Red beds lie at no 

 great distance below, but they do not appear 

 in the immediate vicinity. A few miles west, 

 about Two Butte, the Red beds, with their cap- 

 ping of Exeter sandstone, and included lime- 

 stone, are extensively exposed. Down stream a 

 short distance, east of Two Butte, the Exeter 

 sandstone is seen to be overlain by shales and 

 limestone of typical Morrison formation, in 

 turn capped by Dakota sandstone. No traces 

 of Comanche beds were found in this vicinity. 

 It was hoped that the relations of the Mor- 

 rison and the Comanche formations could be 

 ascertained in this general region, but, owing 

 to the apparent failure of the former to re- 

 appear in the uplift near Mechling's Ranch, 

 no evidence was obtained on this point. 



In December, 1902, Mr. Willis T. Lee gave 

 the Geological Society of America an account 

 of the extension of the Morrison formation 

 down the Cimarron Valley to Exeter, Okla- 

 homa, and the discovery of a low anticline 

 ten miles farther east, in which the Dakota 

 sandstone is underlain by fossiliferous Co- 

 manche beds. 



Another item of interest which I observed 

 in the vicinity of Two Butte uplift was the 

 occurrence of oyster shells in considerable 

 numbers in the Dakota sandstone on Butte 

 Creek just below the Downing Ranch, three 

 and a half miles due east of Two Butte and 

 constituting a ten-foot bed a half mile south- 

 east of Pilleau's Ranch on the headwaters of 

 the North' Eork of North Butte Creek, five 

 miles north by east of Two Butte. 



N. H. Darton. 



U. S. Geological Survey. 



SOME of the results OF THREE YEARS' EXPERI- 

 MENTS WITH CROWN GALL.^ 



The diseases ordinarily classed as crown 

 gall are found on the following plants : 

 almond, apple, apricot, ash, blackberry, chest- 

 nut, cherry, grape, hop, oak, peach, pear, plum, 



^ Summary of a lecture given at the annual 

 meeting of the American Association of Nursery- 

 men at West Baden Springs, Ind., June 15, 1905, 



