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

 1  Avan        (3)  |          Geikie, The Founders of Geology, p. 282. 1897.~ ~
 2  Avan        (5)  |          J.W. Judd, Professor of Geology in the Normal School of
 3 Obser        (34) |        une figure (Principles of Geology, livre III, ch. xvii) représentant
 4 Obser        (35) |        Researches in Theoretical Geology, p. 12.~ ~
 5 Obser        (73) |    observé (Lyell, Principles of Geology, vol. IV, chap. x, p. 9)
 6 Obser        (89) |                    Principles of Geology (5e édit.), vol. II, p.
 7 Obser,    App     |          nom de Producta rugata (Geology of Yorkshire, part. 2, pl.
 8 Obser,    App     | Spirifera rotundata ? Phillips : Geology of Yorkshire, pl. IX, fig.
 9 Obser        (146)|                                  Geology of Yorkshire, part. 2, p.
10 Obser,    App     |   Stenopora ?) tumida (Phillips, Geology of Yorkshire, part. 2, pl.
11 Obser,    App     |         Portlock’s Report on the Geology of Londonderry, pl. XXII,
12 Obser,    App     |       originales de M. Phillips, Geology of Yorkshire, part. 2, pl.