gras = Texte principal
   Partie, Chap.      gris = Texte de commentaire

 1  Avan        (3)  |           Sir Archibald Geikie, The Founders of Geology, p.
 2  Avan             |         naturaliste éditée dans The Minerva Library of famous
 3  Avan        (4)  |       collection des Reports of the scientific Results of the
 4  Avan        (4)  |       the scientific Results of the voyage of H.M.S. Challenger
 5  Avan        (4)  |        de Darwin : II, Rocks of the Cape de Verde Islands, p.
 6  Avan        (4)  | Ascension, p. 39. VII, Rocks of the Falkland Islands, p. 97.~ ~
 7  Avan        (5)  |         Professor of Geology in the Normal School of Science,
 8 Obser        (15) |         dans les Proceedings of the geological Society (vol.
 9 Obser        (28) |        Port Signal, Holyhead et the Crater of an old volcano (
10 Obser,      2     |         les flancs du Crater of the old volcano qu’on les observe
11 Obser        (36) |     Webster a décrit (Voyage of the Chanticleer, vol. II, p.
12 Obser        (63) |      Mexique, dans les Proc. of the geolog. Soc. de juin 1838.~ ~
13 Obser        (72) |                     Geognosy of the Island of Saint-Helena.
14 Obser        (74) |                     Geognosy of the Island of Saint-Helena,
15 Obser        (126)|      Martin White, Soundings in the British Channel, pp. 4 et
16 Obser        (127)|                     M. Siau, On the Action of Waves. Edin. New
17 Obser        (132)|        Dans les Transactions of the Maryland Academic (vol.
18 Obser        (133)|                  Proceedings of the Geological Society, vol.
19 Obser        (140)|     formation, voir Appendix to the Voyage of capitain King
20 Obser        (141)|                  Proceedings of the Geological Society, vol.
21 Obser,    App     |    Captain Portlock’s Report on the Geology of Londonderry,