210 C. S. jProsse?* — Devonian System 



There is every appearance that extensive overflows have taken 

 place over every part of the rim since you were there, and 

 there can be no doubt of a great accumulation of material. 

 The " New Lake " and the intervening depression are totally 

 obliterated. The high promontory west of " New Lake " is 

 lost beneath the flood. The great depression at the south is 

 also filled, though not quite to the general level. The conical 

 form of Halemaumau has become very distinct, and is strongly 

 appreciated in the ascent to it on nearly every side. 



The volcano will soon be very accessible for tourists. The 

 Hilo road is perfectly graded and rolled, and will probably be 

 completed in a few months, when the drive to Kilauea wiil be 

 one wholly of pleasure. The new hotel is a superior one, 

 with lodgings for 70 guests. Plans are in progress for im- 

 proving the walk over the lava. The whole is now in the 

 hands of an active and enterprising corporation. 



Art. XXYIII. — The Devonian System of Eastern Pennsyl- 

 vania ; by Charles S. Prosser. 



[Published by permission of the Director of the tJ. S. Geological Survey.] 



During the summers of 1884 and 1890 personal field work 

 in southeastern New York, taken in connection with an oppor- 

 tunity to carefully study the Devonian exposures of this sec- 

 tion and those of eastern Pennsylvania in the summer of 1891, 

 is believed to have furnished important data toward the proper 

 correlation of this system with the typical Devonian section of 

 central New York. Numerous sections crossing this series of 

 rocks, with quite a collection of fossils, have been made in the 

 region between the Lehigh river in Pennsylvania and the 

 northern part of Green county, New York. A single section 

 across the Devonian terranes of this district will be briefly 

 described in order to make this work available for use in the 

 construction of the Appalachian geological maps and for the 

 purposes of general correlation. The section along the line of 

 the Delaware, Lackawanna & Western Railroad, crossing Mon- 

 roe county, Pennsylvania, is considered .a typical section and it 

 has been selected for the subject of the present paper. It is 

 no more than just to state that the geologic structure of this 

 region, some of which is decidedly complicated, and the strati- 

 graphic position of the formations have been worked out and 

 mapped by Professors J. P. Lesley* and I. C. Whitef in an ad- 



* The Geology of Pennsylvania, vol. i, 1858, pp. 270-289. For a statement of 

 Prof. Lesley's work in eastern Pennsylvania, see 2d Geo!. Surv. Peun., A, p. 102 

 and ibid., G 6 , pp. xiv, xx foot-note. 



f Ibid, G 6 , The Geology of Pike and Monroe counties, 1882 



