88 A GEOLOGICAI, SURVEY OF LAXDS 



river limestone dip northward for a few hundred yards, descend- 

 ing as much as fifty feet, before again resuming their slow climb 

 in that direction. Another fold of about the same size and 

 direction was noted two miles north of Del Rio. This latter fold 

 extends several miles to the east, so that the dip at several points 

 east of Del Rio is to the noith even as far out as near the railroad 

 bridge over^Sycamore creek. Between Pinto creek and Las Moras 

 creek the ledges of the Austin chalk are at several points in a 

 horizontal position and in a few cases they dip north. On 

 Tequesquite creek, from one to three miles above its mouth, there 

 are several abrupt small folds and some small faults. One of 

 these faults crosses the creek about a hundred and fifty yards 

 above the main wagon road following the river. The downthrow 

 of this fault is to the north and amounts to about seventy 

 feet. The trend of the fault is some five degrees north of east. 

 About the same distance below the road there is a small, short, 

 and abrupt monoclinal fold with dip to southwest and a down- 

 throw of only ten feet. In following up Las Moras creek from the 

 same road a reversal of the south dip was noted for a half mile 

 on the Samuel Blair survey. 



Several irregularities of this kind were also noted on the 

 lands north of the Anacacho mountain. 



THE LAMPASITAS ARCH. 



If we project a straight line from the centre of Survey 97 in 

 the Lampasitas pasture in block 6, due north, or a little west 

 of north, we find that this traverses a region where dips are 

 very gentle and more often to the south than to the southeast. 

 In the east part of the Paula pasture, in the Lampasitas, and in 

 the Sauz pastures, dip is either absent, the ledges lying horizont- 

 al or with a slight tilting to the south, or there is a noticeable 

 dip to the west or southwest. Only at a few points is the dip 

 normal to the general structure, to the southeast. Thus the 

 horizontal position was noted in the following places: 



1. SM, .'mrTey 251 . block 7. 



2. E^, survey 20, block 6. 



3. Survey 18. block 6. 

 Survey 19, block 6. 



4. Swi^ surrey 22, block 6. 



5. SWI4 survey 2.3, block 6. 



6. E}4, survey 24, block 6. 



