104 PROCEEDINGS OF THE ACADEMY OF [1890. 



tance of about two miles, ending about three-quarters of a mile south- 

 west of the northeast end of the Radnor belt, bearing precisely the 

 same relation to it and to the Laurentian axis as does the steatite of 

 the better known Soapstone quarry belt to the LaFayette belt. 

 The exposure of the northerly belt is poor, but it is of no little 

 interest on account of its similarity to the soapstone quarry belt and 

 to the fact that along its line occur garnetiferous schists followed by 

 Potsdam sandstone and limestone. A trench dug for water pipe on 

 the property of Judge Hare about a mile northeast of Radnor Sta- 

 tion afforded a tolerable section. The trench was about N. 75° W. 

 while the strike of the belt is probably N. 60° E. ; the distances given 

 are corrected so as to approximate the dip line. 



Foot of hill E. Mica schist, decomposing steatite with numerous 

 40 feet cavities filled with ferric oxide exactly resembling 



that of the soapstone quarry below LaFayette 

 w^here the ochre is due to weathering of Breun- 

 nerite. With this was chlorite schist. 

 90 feet Slaty serpentine. 



200 " Hard serpentine. 



300 " Talc schists and hard serpentine. 



350 " Rogers' altered primal. 



375 " Mica schist. 



425 " W. Rogers' altered primal. 

 A half mile southeast of the LaFayette belt, lies the steatite belt,, 

 in which quarries for soapstone have been wrought for over a cent- 

 ury. The LaFayette belt appears to end northeastwardly in a small 

 valley of an afHuent of the Schuylkill, not far from the river. 

 The steatite belt however extends further northeast, and crosses the 

 Wissahickon near Chestnut Hill, Philadelphia, ending in the schists 

 of Chestnut Hill, near Thorp's lane a short distance southwest of the 

 turnpike. 



This is another, but probably purely accidental resemblance be- 

 tween the two belts, both being much shorter, but beginning much 

 more northeastwardly than the corresponding parallel serpentine 

 belt. 



The characteristic of this belt is a steatite including masses of 

 very hard black serpentine. These have resisted erosion and some- 

 times appear along the outcrop like huge boulders, some of them, 

 near the soapstone quarry, being separate and of many tons' weight. 

 Some of the black masses are pseudomorphs after staurolite. ^ 

 1 Proc. Acad. Nat. Sci. Nov. 21st, 1871. 



