26o 



shore, the contact between the Windsor series and the 

 Point Edward formation Hes between the two closely 

 located light houses. Northward from these lights 

 occasional low outcrops of the Point Edward formation 

 may be seen, in ascending order. Rounding Point Edward, 

 outcrops in descending order continue southward to the 

 landing pier at the Quarantine station. 



The Point Edward Formation. — -On the farther side of 

 the first little bay north of the landing pier, a bed of dark 

 grey shale furnishes the typical fauna of the Point Edward 

 formation, including Leaia. At the point beyond, mud- 

 cracked limestones, red shales and reddish and purplish 

 sandstones typical of the Point Edward formation, may be 

 observed. The sandstones are characterized by cross 

 bedding, the result of translation ripples. Plant fragments 

 are abundant and branches several feet in length are not 

 unusual. There are also peculiar vertical tubes distri- 

 buted abundantly through the sandstones, the origin of 

 which is uncertain. 



Sectio?i of Millstone Grit and CoalMeasnres in the Vicinity 

 of North Sydney. The Millstone Grit and Coal Measures 

 form a thick, conformable series outcropping on the 

 western shore of Sydney harbour and Northwest Arm from 

 Limestone creek on the south to Cranberry head on the 

 north. Throughout this whole section, which has a length 

 of about 7>2 miles (12 km.), the strata dip at angles of 

 from 5° to 15° to the north and north-northwest. The 

 total thickness of measures displayed is about 5,350 feet 

 (1,830 m.) of which the upper 1,725 feet (525 m.) belong to 

 the Coal Measures. The Millstone Grit strata are almost 

 entirely grey sandstones w^hich towards the base of the 

 formation are conglomeratic, while at the summit they are 

 interbedded with variously coloured shales. One coal 

 seam, with a thickness of about 2 feet (o-6 m.) occurs in 

 the Millstone Grit towards the top of the formation. 

 The Coal Measures consist of grey sandstones, dark and 

 variously coloured shales, thin limestones and numerous 

 coal seams which individually are as much as 6 feet (i • 8 m.) 

 thick, and have a combined thickness of nearly 42 feet 

 (i2-8 m.). 



The exposures of Millstone Grit to the southward of 

 North Sydney are monotonously alike. The upper part 

 of the formation is well exposed along the shore to the 

 northward of the town and the strata there are quite 



