472 CHARLES S. PROSSER 



and the steeper to the cast. These ripple-marks occur in somewhat 



thin bedded dolomites, like those to the west of Peebles, called 

 Springfield by Dr. Foerste, and apparently are in the southern 

 continuation of those beds. 



\t\ir Locust Grove. On the western side of Locust Grove branch 

 of Crooked Creek. 1 mile west of Locust Grove and nearly opposite 

 the house oi James Ogden, in the West Union limestone are ripple- 

 marks running X. 12 \Y. and S. 12° E. Some rods farther down- 

 stream and 30 feet higher on the bank in the West Union limestone 

 are rather large ripple marks running X. [O W. and S. io° E. 



Leesburg. Ripple-marks occur in Lee's Creek in the gorge 

 below the Paris Mill and north of Leesburg in the northern part 

 of Highland County, The ripple-marks occur in the Blue Cliff 

 dolomite, which Dr. Orton correlated with the Springfield dolomite, 

 and just below a massive layer ~) feet thick, which is well shown 

 on the eastern side of the creek where the rock has been quarried 

 to a small extent. The ripple-marks are rather irregular; but 

 one runs X. 30° E. ami they appear to be steeper on the western 

 slope than the eastern. 



Monroe formation. Ripple-marks were noted at three horizons 

 in the Monroe formation, 2] miles east of Peebles; but the area 

 exposed in each case was too small and the ripple-marks too imper- 

 fect to make any definite measurements. The lowest layer is 

 exposed in the bed of Morrison Run some distance below the spring 

 and house of John R. Morrison, on the road to Bacon Flat school- 

 house, and it is about 15 feet higher than the base oi the formation. 

 The highest one is shown in the highway leading up the hill to the 

 west of the John R. Morrison house, and is stratigraphically some 

 86 feet higher than the base of the Monroe. The direction of these 

 ripple-marks is somewhat irregular; but they run about east and 

 west. The third ami intermediate horizon is on a layer in the 

 Virginia Product quarry, just south oi the Norfolk & Western 

 Railway, about 2$ miles east of Peebles, and it is more than 25 feet 

 above the base of the Monroe dolomite. 



DEVONIAN RIPPLE-MARKS 

 Sandusky. The best example of ripple-marks in the Devonian 

 limestone that the writer has seen is in Plant Xo. 2 of the Wagner 



