370 R 0. Hovey—Trap Bulges of the 



where it is in contact with the trap. At this place (D), which 

 has been mentioned already, the strike and dip of the strata 

 could not be satisfactorily determined, but it is evident that 

 the trap intersects the layers obliquely and is a dike. 



The underlying rock of Pond Rock is well exposed in the 

 precipitous western faces of the first and second divisions, 

 where the contact in many places is sixty feet above tide, and 

 on the southern ends of the second and third. The sandstone 

 is hard and compact at and near the contact, but farther down 

 there are some loose and shaly layers At the foot of the lake 

 the strike of the sandstone' is N. 10° E., its dip 50° E. A 

 good cross-section of the contact is shown on the southern side 

 of the railroad cut just east of the abutment of the" wagon 

 bridge over the cut ; on the northern side the abutment hides 

 the contact. At and near the contact the sandstone is much 

 indurated, and the trap and sandstone are so firmly united that 

 hand specimens of the contact can be trimmed with the ham- 

 mer without loosening the joint. The trap seems to lie con- 

 formably upon the sandstone, which strikes 1ST. 16° E., and dips 

 40° E. Most of the sandstone exposed in the western part of 

 this cut is shaly and irregular in texture, but there are a few 

 layers of compact rock. North of the railroad the underlying 

 rock has been observed at only three places ; everywhere else 

 it is covered with the talus of the trap bluff or with earth, and 

 no contact has yet been found. The first exposure is in the 

 silver seekers' trench, a mile and a half from the railroad, and 

 is of fine soft shale and hard drab sandstone, the latter being 

 the nearer to the trap. The next exposure is nearly two miles 

 from this, in a ravine, on the northern slope of the rock, five- 

 eighths of a mile east of the crossing of the Branford-Foxon 

 road (R). The rock is a rather soft red shale some distance 

 below the trap, with its strike S. 87° E., and its dip 25° S. 

 Three- eighths of a mile farther east the third and most exten- 

 sive exposure occurs. Near the probable location of the con- 

 tact a rather soft, fine-grained, well laminated, brownish red 

 shale is exposed. Its strike is S. 70° E., and its dip 23° S. 

 Going down the ravine the edges of the strata are crossed, 

 which are of coarse, hard red and brownish red sandstone inter- 

 laminated with shale which varies much in texture. The 

 exposure extends for some 300 feet down the gentle slope. 



The rock beneath the southern hook of Toket mountain is 

 exposed at several places on the New Haven-North Branford 

 road as a loose sandy shale with strike S. 65°-70° E., and dip 

 about 18° N. This should be noted in connection with the 

 strike and dip of the shale on the other side of the transverse 

 valley beneath the northern hook of Fond Rock. No expos- 

 ure near the contact was found. 



