724 ME. F. E. C. SEED ON THE LOWEK PALEOZOIC [NoV. 1 899, 



embedded in a greenish matrix with broken crystals of felspar, 

 etc. The bed averages 15 feet in thickness. 



At this point masses of shingle and seaweed hide much of the 

 outcrop of the beds, but below the agglomerate a series of alter- 

 nating felsites [503] [568] and greenish thin-bedded ashes, 60 feet 

 or so thick, can be traced. 



An angular rib of a compact greyish felsitic rock [605] with a 

 thickness of 10 to 12 feet stands up here on the beach, and under 

 the microscope is seen to consist of an agglomeration of fragments 

 of highly vesicular lava in a finer pumiceous matrix. A pale 

 greenish, massive, well-jointed felsite [13 w] [501], 20 feet thick, 

 occurs below, and then a thin band of nodular felsite [14 w] 3 feet 

 thick. Beneath this is a greenish-grey flinty felsite [502] 50 feet 

 or so thick, and another nodular felsite of a darker colour, 

 6 feet thick. 



Eedded bluish-grey massive felsites [15 w] amounting to a 

 thickness of 20 to 30 feet, in places crushed, and with a few 

 fragmental beds near their base, follow next in descending order 

 with the usual dip ; and we then meet with several tongues and 

 irregular veins of a pale grey intrusive felsite [16 w] irregularly 

 cutting across the strike of the felsites for a distance of 160 feet or 

 more at the base of the cliffs. This felsite, which is of a type en- 

 tirely different from those of the bedded series, has been intruded into 

 the latter, rendering them horny and fissile, and strips of them 

 occur between the intrusive tongues. One of these included masses 

 measures 10 feet across, and consists of dark greenish massive 

 felsites [18 w], some of which are nodular with intercalated tuff- 

 bands. Beyond this intrusion bedded felsites, occasionally nodular, 

 and thin-bedded ashes again set in to a thickness of about 40 feet. 

 An intrusive tongue of fine-grained dark grey felsite [20 w], very 

 similar to that just mentioned, is then met with, having a width 

 of 30 to 40 feet near the cliffs, but thinning seaward. A crush- 

 zone, 1 foot thick, is found on its northern margin. Beyond it are 

 bedded, grey, compact, horny felsites [21 w], with some thin nodular 

 bands [22 w] intercalated ; they are crushed and altered where in 

 contact with the intrusive rocks, and do not amount to more than 

 30 feet in thickness. A mass of intrusive rocks, felsites [606], 

 etc. extends from them for some 300 feet or more along the 

 shore, showing signs of crushing on its margin, and apparently 

 consisting of several more or less distinct intrusions, differing slightly 

 in colour and texture. Parts of it contain numerous xenoliths, and 

 are scarcely distinguishable from, a fine ash. As we approach 

 nearer to the northernmost point of Newtown Head it [606] includes 

 several large masses and blocks of the bedded felsites [44 w] 

 and greenish ashes, some of them still preserving their bedding- 

 planes. There are no signs of bedding in the intrusives. 



At the northernmost point of Jlewtown Head a green diabase 

 [607] sets in ; it is penetrated by veins of a rock very similar to 

 the felsite [606], but the smaller veins of it and the margins of the 

 larger tongues are highly vesicular. 



