On Certain Conglovierates near Sydenham. 55 



easterly at 47°. About 15 chains to the N.W. the beds exposed 

 on a steep bank appear to strike N. 5° W. and are nearly vertical. 

 Directly over this, in a track cut up the hillside, the apparent dip 

 is only 35° easterly, but this may be due to slipping on the steep 

 hillside. Higher up stream a good exposure gave a strike N. 10°, 

 W. and dip about 70° easterly, not westerly, as shown here on the 

 Quarter-sheet, and, from here up, high dips are the rule. Down 

 stream in sheet 2 S.W. there is at first an easterly dip about 45° 

 becoming much less further on, and continuing moderate as far as 

 Keilor. The position then at which the colouring ends on the 

 Public Library copy is the boundary between the general high 

 dips on the north-west and the moderate or low dips on the south- 

 east. With the river at a higher level this boundary might 

 easily have been placed further east at the edge of the quarter 

 sheet. 



About a mile to the north west (H on map) a strike N. 18° W. 

 dip about 30° easterly occurs in a low cliff, but near the water's 

 edge the dip is 70° easterly and the strike different, considerably 

 nearer to north. Between the places of these observations there 

 is a fault to which the beds turn from both sides, but the 

 observations were taken clear of all noticeable turning. 



The age of the conglomerates in 7. S.E. may then be regarded 

 as Upper Ordovician probably mostly in slightly lower beds than 

 the fossils of Ba60. Exact comparison of positions of different 

 beds would be affected by faults which are probably common. 



The conglomerate at Keilor is close to localities from which 

 "Upper Silurian " fossils are recorded. Going north from 

 locality 7 the strata exposed form an anticline with a strong 

 northerly pitch, dips and strike being apparently very variable : 

 at one place strike N. 82° E., dip 35° northerly. The beds exposed 

 to the north are therefore newer, and the Keilor conglomerate is 

 probably near the lowest beds exposed in the Silurian area within 

 the limits of the area under consideration. 



Two explanations of the relations of the two series might be 

 offered. 



The moderate dips and irregular strikes of the upper beds may 

 be due to their occupying a crumpled syncline, of which the older 

 beds to the west form one flank, with a steeper, more regular, dip 

 and .strike. This receives some support from the fact that some 



