GYPSEOUS EARTH AT COOGINS POINT. 465 



at other parts of the known area (before described) of the eocene 

 formation. 



This inference added to other considerations caused to be sunk 

 the second shaft above-mentioned in the beach of Coggins' Point, 

 130 yards distant from the first one, which by this time had been 

 filled completely by the sand driven by storms and high tides. The 

 digging was made at a low part of the bank, and which therefore 

 did not show either the eocene marl or the miocene, the former of 

 which is seen in the higher bank at a short distance, and both 

 together at the distance of a mile. The different strata of the 

 actual section at the new digging, taken descending from the top 

 of the bank, were as follows : 



1 foot, surface soil gray loam. 



7 feet of (drift) pale yellow clay, containing much coarse silicious 



sand. 

 4 feet (drift) rounded or water-worn pebbles, of all sizes, from 4 



inches through to coarse gravel, held together by enough clay 



and ferruginous earth to fill the interstices between the pebbles. 



None of the pebbles calcareous. 



2 feet of (drift) very thin layers of hard and gritty gray clay, 

 alternating with others of coarse ferruginous sand. 



2 feet of poor greenish earth, more than half the surface of the 

 section brown in spots, and indurated with oxide of iron. 

 (Here should be, as elsewhere in the neighbourhood, though 



absent at this particular locality, either one or both, the miocene 



marl (A), and next below the eocene calcareous marl (i?) described 



in the preceding pages). 



(6 V ) 9 feet of the ordinary upper layer of gypseous earth green 

 colour, mottled with spots of bright yellow clay (or ochre), and 

 some other spots of unctuous reddish brown clay. Very slight 

 efflorescence of gypsum on the surface. 



(Z)) 3 feet of darker and nearly uniform colour, almost black, from 

 the greater proportion of green-sand. This and the preceding, 

 containing many impressions of shells, but no shells or frag- 

 ments, and no carbonate of lime. More efflorescence of gypsum, 

 and also on next 



3 feet of same, except that some shells are seen and increase 

 in the next to level of river at common high tide. 



6 feet of same (next below tide) the shells mostly cardita 

 planicosta fewer of cytherea and corbula. No ostrea or turri- 

 tella. Small and slender shark's teeth (so called) in perfect 

 preservation, the points and edges being as sharp as in teeth of 

 the living animal. 



15 feet bluish gray or lead-coloured clay (from 6 to 22 feet 

 below tide), having nearly the texture of clay marl. Very com- 

 pact and firm in texture unctuous to the touch, but not adhe- 



