This brown leather notebook contains geological observations in pencil, and detailed sketches of mountain ranges. The cover is blank, and the index is a page adhered to the back cover.

The following table of contents is Lyell's own words, copied from Lyell's own "Index", found at the beginning and end of the notebook, transcribed from digital surrogates using the platform Transkribus. When known, Lyell's abbreviations and contractions have been expanded using brackets []. When writing is unclear, and transcription is not possible, this is denoted using [...]. Quotation marks are Lyell's own notation for ditto, as is the abbreviation "d'o". The inclusion of [sic] indicates the misspelling of a word is deliberate and taken from the notebook.

p. 1, Mont Serrat sandst[one] like Kirriemuir
p. 3, [Mont Serrat] two sections of -
p. 10, Mauresa beds
p. 10, Nummulite beds
p. 12, Foix coal beds
p. 9,12, Castelgali
p. 12, M[ount] Jouich
p. 13, Soria - Sadiorni de Callew, section
p. 14, River Cardona
p. 16, Cardona to Malagrige, sect[ion]
p. 19, [Cardona] salt formation
p. 21, [Cardona] to San Helix di Sassereo, section
p. 22, Sabregal
p. 22, Hills bet[wee]n Orista + Vigni
p. 25, Section bet[wee]n San Juan + Orista
p. 26, Hills bet[wee]n S[an] Juan + San Filice
p. 28, Sect[ion] from [...] Maria to San Juan
p. 28, Cardona sandst[one] represents M[ont] Serrat conglom[erate]?
p. 30, San Juan to Vich, bds like blue + white lias
p. 30, Compare gyp[sum] in red sandst[one] + selenite in blue shale
p. 32, Vich sect[ion]
p. 34, San Juan escarpment
p. 36, Valley [...]
p. 39, Las Planas, 2 sect[ion]
p. 42, [Las Planas] columnar lava
p. 46, Il York de Santa Margarita, cascade in lava
p. 48, Volc[ani]c Ll. de Salvage
p. 51, Valley in clay slate near chapel of Lloret, section
p. 52, Ter river cutting thro white + blue marls [et cetera]
p. 54, San Felice built on lava
p. 54, Castle of Stolles - lava
p. 58, Basaltic curr[ent] cut thro' above Las Planas
p. 60, Sect[ion] of lava curr[ent] at St. Estevan
p. 62, Bolos his memoir when written + published
p. 64, Sandst[one] in Costa di Pejon
p. 64, Mont Crouscat, volc[ani]c
p. 64, Spheroid at decompos[osition] of lava like Scotch trap.
p. 66, Sect[ion] n[ea]r bridge of Cellent basaltic columns [et cetera]
p. 68, Bolos on the Olot Volc[an]o
p. 72, Aroustat sections
p. 76, Olot sect[ion] n[ea]r bridge
p. 78, Olot earth[quak]e at period of volcanic erupt[ion]
p. 84, Olot Volcanos, view of