320 C. N. FENNER 



show us the changes in the trap by which we can recognize its position. 

 I will now take up some of the typical exposures and describe any 

 details which may seem of importance. The most northerly point 

 at which I have found evidence of the existence of the lake is at the 

 corner of Union Ave. and Marion St. in Paterson. There is a small 

 outcrop of trap here, showing bowlder forms and glassy crusts, stained 

 with copper. About half a block south is the site of Hoxsey's quarry, 

 which many years ago was a famous hunting-ground for mineral 

 collectors, and specimens from which are found in cabinets throughout 

 the country. The hill of trap which formed the quarry was leveled 

 off years ago and work was abandoned. A large part of the quarry 

 ground is now built up with houses and nearly all trace of it is gone. 

 When I was familiar with it the form of its structure bore little signifi- 

 cance to me, but I remember the general details and believe the 

 structure was almost a duplicate of that now showing in the upper 

 portions of the West Paterson quarry. In one place the floor of the 

 quarry showed calcite-impregnated, amygdular trap, but work was 

 not carried below this. I do not recall the presence of sandstone 

 inclusions, but upon a recent visit to the locality (September, 1907) 

 I was lucky enough to find a little work going on in Kearney St., 

 apparently for a sewer connection, which showed perfectly the crusted 

 bowlder-forms and the vugs and also sandstone inclusions. 



Southerly from here is an exposure just east of the reservoir on 

 the hill near the Soldiers' Monument. The outcrop is small but the 

 characteristic features are well developed. This exposure is only 

 a few hundred feet west of the cliffs where Figs, i and 2 were sketched 

 and we are now able to appreciate the full significance of the valley 

 shown in these sketches. We see that a river at one time entered the 

 lake at this point, but its valley had been nearly filled and its course 

 almost obliterated until only a shallow depression remained at the 

 time of the trap flow. Its bed was dry, as is shown by the slight 

 degree of vesicularity of the trap at the contact and the close texture 

 above, whereas, over the lake bed the water-soaked muds wrought 

 changes in the trap to a much higher level. 



Going a little farther south we come to a small abandoned quarry 

 just across the road from the Water Works Pumping Station. We 

 may note the bowlder-forms here with which we have become familiar 



