Rocks near Heathcote. 307 



responsible for the ireneral map and tho reiniunin<r three smaller 

 arpas. 



9. Feri/iiso/i. II'. J/. " Report on an area of Cambrian rocks 

 at Heathcote." Monthly Prog. Rep. Geol. Surv. Victoria, No. 2, 

 1899, pp. 23-25, 1 pi. Mr. Ferguson defined on a sketch geolo- 

 gical map the boundaries of the beds containing the Dinesus 

 fauna, adopting as their upper and western boundary with the 

 Ordovician a thin bed of " brecciated-oonglomerate." Ferguson 

 stated that the trilobites were found in block 3. 1., parish of 

 Knowsley East. 



10. 1\ S. Hall. " Supposed Graptolites from Heathcote." 

 Mon. Prog. Rep. Geol. Surv. Victoria, No. 11, 1900, p. 26. Mr. 

 Hall was unable to identify with certainty any of the remains 

 submitted to him. He stated that graptolites of the Bryograptua 

 type were probably present. 



11. Gregory, J. W. "The Heathcotian, a Pre-Ordovician 

 Series, and its Distribution in Victoria." Proc. Roy. Soc. Vic- 

 toria, Vol. XV. (New Series), Pt. II., 1903, pi. 4. Professor 

 Gregory discussed the previous literature, examined further trilo- 

 bite remains from Knowsley East, and showed that the original 

 Dinesus described contained two genera. The new genus he 

 named Notasaphns, and suggested that the* Dinesus beds be in- 

 cluded in the Ordovician, as its lowest representative along the 

 Heathcote line. He agxeed with Mr. Howitt in the determination 

 of most of the rocks, but Mr. Howitt's '' adinoles " he described 

 as black cherts and the aplite of Mr. Howitt he regarded as fine- 

 grained grano-diorite. He recorded fragments of diabase from 

 the Silurian quartzites near the " Copper mine," and hence r&- 

 garded the diabases as pre-Silurian. The relations of the cherts, 

 schists and diabase with the Ordovician rocks are discussed, 

 and he regarded the series as of pre-Ordovician age. This view 

 was based partly upon his field observations and petrographio 

 work, but also largely on the evidence of the geological mapping 

 of the district, and on the absence of dykes intrusive into the 

 Ordovician series. 



Prof. Gregory claimed that " Heathcotian rocks " of pre- 

 Ordovician age occur also at Dookie, under the Silurian rocks 

 of Rushworth, W. and N.W. of Geelong in the valleys of the 

 Barwon and the Moorabool, at Mt. Stavely in W. Vict-oria, prob- 



