84 J, A. Birds — Geology of the Channel Islands. 



along the upper road to Grouville, to the windmill above the village, 

 and thence to the neighbourhood of Sion House (where it is very 

 much decomposed) — and last to the quarry east of Victoria College, 

 and the rocks underneath the College itself. Between these three 

 great masses of syenite there lies upon the west a thick formation of 

 shale or schist (e), which extends without interruption from St. 

 Ouen's Bay to the western or lower branch of the Val des Vaux, close 

 to St. Helier's. At this point it is broken by an outburst of volcanic 

 rocks, which have altered it into a claystone porphyry, but it 

 appears again in an unaltered form a little north of Sion House, and 

 between Le Bourg and Petit Catillon, north of Grouville Church. 

 The general character of the rocks is that of a bluish-grey argillaceous 

 schist, with bands of hard grit. Sometimes (as near St. Helier's) it 

 is a brown, sandy, finely -laminated shale. Occasionally I observed it 

 take a cherty character, as, e.g., near St. Aubin's, on the right of the 

 main road to St. Brelade's. 



The north-eastern portion of the island is occupied by a formation 

 (/ and g of Prof. Ansted's section), variously composed of por- 

 phyries, hornstone-schist, altered sandstone, quartzite and quartzose 

 conglomerate, which extends in a wide belt or broken arc from 

 Fremont Point, above Bonnenuit Bay, and L'Etaquerel, in Bouley 

 Bay, southward to within about a mile and a half of St. Helier's ; 

 and thence eastward by the Grand Val Mill, in the Val des Vaux, 

 till it appears upon the coast again between Anne Port and St. 

 Catherine's Tower, in St. Catherine's Bay. The points where it may 

 be best examined are the quarries at La Crete Point in the latter 

 bay, in a quariy a little north of Grand Val Mill, on the road from 

 the latter to La Boucterie, in Blanche Pierre Quarry, in the lower or 

 western branch of the Val des Vaux, in Bonnenuit Bay, and in the 

 quarries on the Jardin d'Olivet above Bouley Bay. The quartzite 

 and quartzose conglomerate are extensively quarried all along the 

 cliffs between these two bays. 



Resting upon this formation. (/ and g), and occupying the whole 

 of the extreme north-eastern corner of the island, from a little 

 south of St. Catherine's Tower, in St. Catherine's Bay, to between. 

 L'Etaquerel and La Tour in Bouley Bay, lies a newer argillaceous 

 breccia or conglomerate (/i), composed mainly of chloritic slate and 

 ferruginous sandstone, but with blocks of syenite, granital, quartz, 

 and many other kinds of rock scattered throughout the mass. The 

 boundary of the deposit inland may be traced from a little west of 

 Carmel Chapel, on the road between the Jardin d'Olivet and Eozel, 

 and near the lodge of Rozel Manor, and thence to a point about 

 half-way between St. Martin's Church and St. Catherine's Bay, 

 where it may be seen resting upon the altered sandstone (/). The 

 finest sections, however, are those of the quarries at Verelut Point. 

 Both there, and all along the coast to Eozel — but particularly in 

 Port Sale — there are ample opportunities for its examination. 



On the left of the road descending to Bouley Bay, and also, accord- 

 ing to Mr. Ansted, at the back of St. Catherine's Bay, there are two 

 small patches of a still newer formation, consisting of a fine-grained 



