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Point Edward Post Office to the Quarantine Station on 

 Point Ediuard. — The branch railway from the Umestone 

 quarries at Point Edward post office, runs southward to 

 join the main line of the Intercolonial railway. This 

 branch railway passes on the western side of the north- 

 easterly pitching anticline whose position is marked to the 

 south by the Pre-Cambrian area of the Coxheath hills 

 around which the Lower Carboniferous beds are symmet- 

 rically disposed. Leaving the quarries, the railway passes 

 through a belt of northerly and gently dipping red and 

 purple, sandy shales, sandstones and conglomerates 

 underlying the Windsor series and forming part of the 

 original Limestone series. Farther south, the branch 

 railway enters the area of reddish conglomerates of the 

 Conglomerate series which extends southward over and 

 around the Pre-Cambrian rocks of the Coxheath hills. 



From the point of junction of the branch railway and the 

 main line, the Intercolonial railway runs in a northeasterly 

 direction towards and then around the head of the North- 

 west Arm of Sydney harbour. Along this course the rail- 

 way passes over the Carboniferous strata in ascending 

 order as they occur on the western limb of the Point 

 Edward anticline. For some distance west of the railway 

 junction, the underlying strata belong to the Conglomerate 

 series; beyond this occur the measures of the Limestone 

 series outcropping along the eastern shore and about the 

 head of the Northwest Arm. The strata dip to the north- 

 west at angles of 5° to 20°. In the vicinity of Leitch 

 Creek station, the measures belong to the Windsor division 

 of the Limestone series; beyond this, on the western 

 shore at the head of Northwest Arm, the strata belong to 

 the Point Edward division which farther west along the 

 railway are succeeded by Millstone Grit beds. 



Proceeding by boat from Leitch Creek station, north- 

 ward down the waters of Northwest Arm, low outcrops 

 of the Point Edward formation may be observed in the 

 banks on the west. These dip to che west under the Mill- 

 stone Grit which forms the high hills a few hundred metres 

 beyond the shore. The Point Edward formation is only 

 shown for a short distance, when it passes entirely below 

 the Millstone Grit. The contact is a sharp one, and is 

 moderately well shown. From the contact northward to 

 beyond North Sydney, outcrops of the Millstone Grit are 

 more or less continuous on the west bank. On the east 

 35063— 4|A 



