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"Former Lemoos." — Jan. 6^th [1835]. — Lat 44°: 30'

All tertiary formation, composed of layers of fine blackish grey sandstone (2468: 69) very similar, but rather coarser to those of Chili, non-calcareous specks of mica; even laminae; with lines of comminuted shells. — Here & there irregular mamillated concretion of fine grained hard calcareo sandstone: these especially contain shells & shells 2473 in a more perfect state: There are also layers of these concretions, but smaller, which affect most singular shapes: cylinders, egg-shaped, intestine-shaped & bone-shaped 2470: 71; also pebble shaped.

I noticed could not extract the Cytheraea of Chiloe specks with concentric lines & a common Cytheraea — a Turbo & a Caryophyillia &c &c. — A small patch & black glistening lignite was present. — The sandstone was crossed by veins fissures, then on each side had coked the sandstone with ferruginous matter which had penetrated the stone two or 3 inches & gave a singular banded appearance to the

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(a) As so generally the calcareo-hard sandstone nodules chiefly contain the shells. — What is the cause: Has the calcareous matter determined presence of shells? & has its solidifying power preserved them?

Did they exist when this matter was not present? — We must suppose the concretionary structure to be formed at some depth within the deposit: yet the specimen (2472) seems to show that the lamelliform corall coated & adhered to one of these concretions lying on the bottom. (The concretion was 8 or 9 inches in diameter & very irregular in outline). I cannot reconcile these views. — Perhaps strata were disposed during deposition & parts thus exposed, & subsequently recovered: —

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"Former Lemoos." — Jan. 6^th. — (5

stone. — A very few siliceous pebbles: perhaps few greenstone boulders on coast from same origin: Judging from fragments there must be layer of "alluvium" with gravel on top of island. —

Dip to East ∠^r 30-40°. Yet I am nearly sure, only immense masses (& faults) which had slipped from their place. —

[sketch] 1

[sketch] 2

Double elevations. V. Fig. 1 & 2. —

Formation extensive to East & little North then hills of hard rock. —

Discuss shells in concretions. — (a)

Manifestly same formation as that of Chiloe