132 Mr. D. Sharpe on the Geology of 



the force of the earthquake ceased to be destructive, corresponding exactly with the 

 boundary of the tertiary beds. 



The earthquake did not destroy many buildings in the neighbourhood of Lisbon, 

 but I could not find any account of the extent of the damage done ; yet the little 

 evidence I obtained, corresponds with that derived from the interior of the town. 

 Saccavem, which stands upon the upper Almada beds, is said to have suffered 

 considerably; but Queluz and Odivellas, built upon basalt, were not damaged. The 

 bridge of the aqueduct, already mentioned as having escaped, stands across the 

 junction of the basalt and the Hippurite limestone. It is therefore evident, that 

 the violence of the earthquake was quite unconnected with the presence of basalt, 

 with which Link {loc. cit p. 68) and others have attempted to connect it. 



Postscript, September 1 5th, 1840. 



Since the preceding paper was laid before the Society, a more complete exami- 

 nation of the fossils has altered some of the views I at first entertained as to the age 

 of the secondary deposits* ; I had thought the following to be equivalents : 



Hippurite limestone Cretaceous series. 



Red sandstone formation Oolitic series. 



Espichel limestone Lias. 



I am now disposed to consider all those three formations referrible to the creta- 

 ceous series of the North of Europe ; following in this respect the opinion of MM. 

 Boblaye and Virlet, who refer to that series a similar succession of beds observed 

 by them in the Morea, although I cannot quite agree with those gentlemen in 

 identifying the separate beds of the South with individual deposits of the North 

 of Europe. 



Hippurite Limestone : as this is a calcareous deposit forming the upper part of 

 the cretaceous series, and nearly all its shells belong to the chalk and green sand, 

 it may be taken as the equivalent of our chalk. 



Red Sandstone Formation : this contains shells of our green sand mixed with 

 others of the oolites. MM. Boblaye and Virlet describe, in the Morea, 



Gres vert super ieur, 

 Calcaires lithographiques, 

 Gres vert infe'rieur ; 



and in the South of Spain Colonel Silvertop mentions three formations corre- 

 sponding with the above divisions ; thus in the Morea and in Andalusia the cal- 



* Proceedings, vol. iii. page Si, 



