This green leather notebook contains diverse notes by Lyell, including lists, observations, sketches, and plans for future tours to Wales and North America. Notes are in pencil and ink. There is a sketch of a compass p. 21, and a list of books on American geology at the Geological Society of London on p. 101. The index is the last three pages of the notebook, both covers are unmarked.

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.

No 88, Index, Jun 16 to July 23 1841
p. 1,49, Wales, mem[oranda] for tour in
p. 3,4,6, [Aymestry] fossils in Mr. Lewis's collection
p. 32, [Aymestry] gravel, section
p. 68, [Aymestry] limest[one] in Gatley escarpment
p. 108-110, [Aymestry] corals in natural + others in reversed prosition in limestone of,
p. 3,4,6, Lewis, Mr. his collection of fossils
p. 21, [Lewis, Mr.] his collection of fossils
p. 52,54, [Lewis, Mr.] on escarpments
p. 68, [Lewis, Mr.] on separ[ation] of Wenlock + Aymestry limestones in Gatley escarpment
p. 6, Ludlow, [?], quarry at,
p. 42,43,46, [Ludlow] fossils + section
p. 43,44, [Ludlow] Museum
p. 8, Nether Lye, section at,
p. 10, Wenlock fossils
p. 60, [Wenlock] Edge, drawing of,
p. 68, [Wenlock] + Aymestry limestones, separat[ion] of in Gatley escarpment
p. 70, [Wenlock] remarks on strata bet[ween] Aymestry +,
p. 108, [Wenlock] corals in nat[ional] position in limestone of,
p. 16, Llanesinny section, up. Ludlow
p. 16, Pendraig quarry
p. 18,19, Builth, section + fossils
p. 19, Wallsgrove, inverted beds at,
p. 20, Aberley Hills corals reversed in
p. 19, [Aberley] beds reversed
p. 21, Compass, Mr. Lewis' notes on,
p. 22, Till with large boulders between Builth + Llandrindod
p. 64,28, Boxes, contents of
p. 29, Box sent to Prof[essor] Shepard by Mr. Lewis
p. 68, Gatley escarpm[ent] separ[ation] of Wenloch + Aymestry limestones in,
p. 34, [Gatley] Elton sect[ion] a prolongation of,
p. 36, Clungunford quarry, Wenlock shale
p. 40, Downton Castle
p. 40, Encrinus on convex side of corals
p. 43, Fish bed at Ludford
p. 48, Escarpments in Siluria like those in Jura
p. 48,52, [Escarpments] from Aymestry to Elton
p. 68, [Escarpments] Gatley
p. 54,57, Murchison's Map + Sect[ion]s, remarks on,
p. 59, Gorge of the Onny
p. 59-62, Horderly section
p. 66, Gleedon Hill quarries
p. 66, Bradley quarry
p. 20, Corals, reversed in Aberley Hills
p. 108 [Corals] in nat[ional] posit[ion] in Aym. + Wenlock limestones
p. 110, [Corals] others inverted
p. 110,112, Subsidence druing Silurian period
p. 59, Onny, gorge of the
p. 34, Teme, gorge of the,
p. 64, American Silurian
p. 72,73, [American] lectures, Illustr[ations] for,
p. 101, [American] Geology, books on at Geol[ogical] Soc[iety]
p. 104, America, best months for going to,
p. 74,75, Featherstonehaugh, notes by,
p. 75, Parallax - Earth's diamter +c
p. 78, Sturgeon, skeleton of,
p. 78, Owen, on fish of Old Red
p. 81, Emmons's Report, notes on,
p. 83,92,93, Conrad's [Report], [notes on]
p. 82, Mem[oranda] + queries for America
p. 86 to 99 Geol[ogical] Soc[iety] Mus[eum]
p. 86, Lonsdale, Mr. on Amer[ican] Silurian fossils
p. 94, [Lonsdale Mr.] on coal plants of Devonsh[ire] +c
p. 96-99, [Lonsdale Mr.] on distinctions between Corals
p. 106, Murchisons, letter to,
p. 78, Old Red Sandst[one] Owen on Fish of,
p. 34, Teme, gorge of the, at Downton,
Addresses
p. 78, Brown, Richard
p. 80, Green, Rev[erend] C.
p. 8, Lewis, Rev. T. J.
p. 75, Foord
p. 102, Robinson