Abstract
Plates XIV. and XV. PRELIMINARY REMARKS. In 1832 I laid before the Geological Society a few remarks on the strata in the neighbourhood of Lisbon; but having since spent some time in that city, I have been able to extend my observations and to correct the errors into which I had before fallen. During the latter part of my stay, I had the advantage of becoming acquainted with the Baron d’Eschwege, the author of a paper upon part of the district, in the eleventh volume of the Memoirs of the Royal Academy of Sciences of Lisbon, to whom I am indebted for much valuable information. In the present paper my former remarks are repeated only as far as is necessary to render the rest intelligible. I shall first describe the aqueous formations, following the descending order, both in the general arrangement of the subject and in the tables of beds and description of sections ; and then the igneous rocks, with the disturbances which the sedimentary deposits have undergone. A few remarks on the great earthquake of 1755 are given as an appendix. Tertiary Formations. The tertiary beds appear to be entirely of marine origin, and they may be divided into three formations : 1. Upper Tertiary Sand. 2. Almada Beds; consisting of. calcareous sands, sandy limestones, marls and clays. They may be best observed in the cliffs on the south bank of the Tagus, near the village of Almada. 3. Lower Tertiary Conglomerate. These deposits
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