476 
THE GEOLOGIST. 
tainiug but few fossils (Pecten, Ostrea gigantea), and dipping to the 
N.E. at an angle of 25° or 30°. 
" Below the lighthouse a very hard tine-grained limestone, or rather 
a calcareous freestone, presents itself intermingled with the other beds, 
and containing Cytherea Verneuilii, &c. Some deposits containing 
pebbles, ten or twelve yards thick, overlie the whole of these beds. 
" Beyond the Point St. Martin begin the cliffs of the ' Chambre 
d'Amour.' They are formed of somewhat soft sandy limestones, with 
Operculina, Ostrea gigantea, and Venus transversa ; here also may be 
observed the same beds of hard bluish calcareous freestone with 
Scalaria, &c., as those beneath the lighthouse. At the extremity 
north of the little bay, the hard freestone is scattered, as it w^ere, 
through the softer sandy rock in the form of flattened detached 
nodules, disposed in somewhat regular beds. Advancing from the 
lighthouse, these nodules increase in volume and become blended 
together in more continuous masses, till at last they entirely replace 
the more friable rock, in which at first, beneath the lighthouse, they 
only ])artially appeared. 
" The preceding description leads naturally to the following conclu- 
sions : — 
" 1st. The nummulitic strata of the cliffs of Biarritz dip regularly 
to the N.N.E., except for a short space w^here their inclination is in a 
reverse direction, opposite the ophite rock. Consequently, in follow- 
ing the coast-line from the commencement of the nummulitic cliff to 
tlie point north of the Chambre d'Amour, the strata are in regular 
sequence from the older to the more modern deposits. 
"2ndly. From the commencement of the nummulitic cliff to the Port 
des Basques, there is a vast system of calcareous deposits, first arena- 
ceous, afterwards argillaceous, and characterized principally by the 
Gucttardia Thiolati, Num. spissa, N. coriij^lanata, Serpula spirulcea^ 
&c. At the Port des Basques these beds disappear beneath the fol- 
lowing deposits. 
" 3rdly. From the Port des Basques to the St. Martin lighthouse, 
that is to say, through the whole mass of the point of Biarritz, and a 
part of the Cote du Moulin, yellow or blue sandy calcareous deposits, 
vrith rolled pebbles of flint or limestone, follow the strata previously 
described. The fossils of the former beds are no longer found. Their 
place is taken by the Eupatagus ornatus and the Nummulina inter- 
media, which appear for the first time. 
"4thly. Finally, from the lighthouse to the extremity at the Chambre 
d'Amour, a system of hard, tine-grained, calcareous freestone is de- 
veloped, associated with Operculina sands. These rocks no longer 
contain the Eihpatagiis ornatus, nor the Serpula spirulcea, but they 
present a certain number of fossils, for the greater part identical with 
the species found in the Paris basin, and unquestionably characteristic 
of the Tertiary period. The Operculines seem here to replace the 
Nummulites." 
•jt * * 45- •* * * 
The work from which I have quoted contains an elaborate account 
