56 Harris and Crawford : 



On the opposite side of the Mount Alexander Road, about 

 400 yards downstream to the east, a submerged band of rotten 

 blue slate yielded Diplograptus only, but exhaustive search was 

 impossible. The nearest Upper graptolite beds are about half 

 a mile eastward, though unfossiliferous shales closer at hand 

 are probably Upper Ordovician. 



(III.) In Sect. 14, east of Gisborne Cemetery, decomposed 

 blue shales gave Diplograptus. The age of the beds is unknown. 

 (IV.) In the bed of the Djerriwarrh Creek, between Allots. 

 4 and 5, Upper Ordovician graptolites occur. After crossing a 

 basalt residual — the Glendoon Spur — Upper Castlemaine grapto- 

 lites are found. The distance between the two outcrops is about 

 500 yards, and basalt covers the junction. 



(V.) Upper Ordovician graptolites are found on the southern 

 slope of the Glendoon Spur, and in the bed of the Glendoon 

 Creek at its foot Diplograptus, Climaco graptus, Crypto graptus 

 and D ice 11 o graptus occur, while the ridge on the western side of 

 the creek gave — 



Didymo graptus caduceus, Salter. 



,, ,, var. manubriatus, T. S. Hall, var. 



Didymo graptus, horizontal species. 

 Trigono graptus, sp. 

 Gonio graptus speciosus, T. S. Hail. 



A traverse here must cross the junction of Upper and Lower 

 Ordovician. We made several trips up and down the Glendoon 

 Creek, but are unable to find any structural break. The blue 

 Upper Ordovician slates are succeeded upstream by green and 

 brown arenaceous rocks. The softer and probably fossiliferous 

 bands are poorly exposed. The first fossiliferous band above the 

 Dicello graptus beds yielded only Diplogra,ptus and Cryptograptus 

 tricornis, Carruthers, and may be either Upper or Lower Ordo- 

 vician, though we are inclined to regard it as Upper. In un- 

 promising material further upstream we found the continuation 

 of 'the hillside beds, and obtained the same forms as from the 

 hill, with the exception of Goniograptus speciosus, and in addi- 

 tion — 



Didymo graptus v-deflexus, Harris Ms. 



Oncograptus upsilon, T. S. Hall, 



indicating plainly the Lower Darriwil horizon. There are varia- 

 tions of strike, but no clear line of division is indicated. As has 

 been stated, the Cryptograptus shales between these Darriwil 

 beds and the Dicello graptus slates down stream, may be Upper 





