192 GEOLOGY AND PETBCGEAPHY OP CLARENCETOWN-PATEKSON DISTRICT, i., 



and are to be found in a well-preserved state in two small quarries on the road- 

 side a few chains west of the railway line at Paterson on the way to Gresford. 

 Towards the base of the northerly-directed scarp of Hungi-y Hill, good fossils 

 from this horizon can be obtained, and particularly fine remains axe seen on a 

 track leading from the northern point of portion 150,- Parish of Barford, down 

 to Dunn's Creek. A little to the east of the crossing of the creek by this track, 

 in a tributary gully, the plant-remains are associated with impure coal seams. 

 In the areas between here and the Williams River the plant-bearing shales and 

 tuffs are always found in the same stratigTaphieal position. Thus one sees an 

 abundance of this material just to the south of the Paterson-Glenoak Telegraph 

 Line in portion 108, Parish of Barford, and excellent specimens of Rhacopteris 

 species occur in the central part of portion 39, Parish of Seaham, and at the 

 foot of the hills close to the Williams River near the junctions of portions 39 and 40. 

 The most southerly occurrence of this horizon is upon the top of Big Brandy 

 Hill in portion 38 where the rock containing the plant-remains is of coarser 

 texture. The horizon cannot be followed very far, either to the east or west, on 

 account of the presence of faults. 



To the east of the Williams River one has no difficulty in locating this hori- 

 zon, as it outcrops at intervals along the cross-road from East Seaham to Ray- 

 mond Terrace, particularly near portion 22, Parish of Wilmot. 



On account of the slight change which takes place in the composition of the 

 igneous rocks developed at Paterson as toscanite, it will be convenient in the 

 description of their regional distribution, to use the term dellenite, when dealing 

 with a locality where such is the identity of the rocks, and the term toscanite in 

 other cases. It has not been possible to say definitely whether the rocks in 

 question occur as a composite sill, as a single flow, or as a series of two or three 

 Hows, but for present purposes they may be considered as one unit. 



The toscanite outcrops at the summit of Mt. Johnstone and is developed in 

 a long dip-slope on the western fall of the ridge, spreading out westward to- 

 wards the head of Webber's Creek. On account of the effect of erosion upon the 

 dome-like structure hereabouts, the junction of the lava with the underlying tuffs 

 swings away to the west, but the toscanite is again encountered along the southern 

 margin of the hills south of Mt. Johnstone, here having an easterly strike. About 

 one mile from the town of Paterson the rock dips at a high angle, the result of 

 an oblique fault, which, although possessing a considerable throw, has effected 

 practically no horizontal displacement of the visible outcrops. (The peculiarity 

 of this feature will be fully discussed in a later chapter). From here the rock 

 passes down into the town of Paterson, outcropping in the railway and road 

 cuttings and, after being cut through by the Paterson River and temporarily 

 lost in the alluvium, is found strongly developed to the east between the Paterson 

 and Dunn's Creek, the dip-slope on which Hungry Trig. Station stands being 

 duplicated to the south by strike-faulting. The junction of the toscanite with 

 the overlying glacial beds is continually exposed along the course of Dunn's 

 Creek, and towards the headwaters of that stream there are a number of small 

 disconnected outcrops, their lack of continuity being the result of erosion upon 

 a locally flatly-dipping series. Then on the road from Dunn's Creek to Red Hill 

 there is a decomposed outcrop, and some dip-slopes of dellenite occur in the 

 rough country comprising portions 18, 21, 22, and 23, Parish of Butterwick. 

 The dellenite may then be traced down through the Water Reserve, portion 39 

 (Butterwick), and becoming very thin, it swing's away to the south, possibly ow- 

 ing partly to the dragging effect of a large fault. The deci-ease in thickness 



