RECORD: Darwin, C. R. 1838.07.16. [Geological notes on Shrewsbury]. CUL-DAR5.B19-B22. Transcribed by Michael B. Roberts, edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Michael B. Roberts. Checked against the Darwin Onlinemanuscript images by Christine Chua and edited by John van Wyhe 9.2020. Corrections by Christine Chua 11.2021. RN2

NOTE: Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.

See: Michael B. Roberts, Buckland, Darwin and the attempted recognition of an Ice Age in Wales, 1837-1842. Proceedings of the Geologists' Association 123, 2012, pp. 649-662.


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Shrewsbury: July 16th (Monday) 1838                                   

a small red sand pit on left hand side of lane connecting the Copthorne & Bishops' Castle Road - a small piece of shell. (I forget whether I found any last year.

the fine current cleavage red sand, with few small rounded pebble covered unconforming found early mass.

very slightly calcareous.

This red earthy mass in part in sandy interstratified with mass of the gravel. like [mica] gravel & with few larger pebbles.

The lowest irregular layer of this reddish rather compact earth contained one til of shell & was slightly calcareous

(N.B. in gravel of all pits there are some limestone pebbles & much lime, coals

Rocks of rocks.

 

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This deposit reminds me strongly of Pampas substance, except presence of pebbles & absence of concretions. I do not doubt in all these cases it will turn out to be estuary.

[round] with glaciers acting.

In this & other pits in neighbourhood I observe pebbles are well rounded excepting those

of slate. like those by Loch Dochart in Scotland or at the head of upper shelf in Lochaber

No [mica] Granite, get into particle I saw in the quarry.

There are some quarries with

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no distinct covering of this estuary mud.

The Quarry [near has] found shells in the Quarry of Bishops' Castle road, but only in the

sandy beds, are common in a pit on Church Stretton road. between Shrewsbury & Meole Brace

Wednesday. Shelton Rough it is not to be questioned the small pebbles, which form

bed full of broken bits of shells, are more rounded & have different character, with very many more red sandstone pebbles than earth or estuary alluvium.

I could not see in it any true granite, more in upper alluvium.

but a red granite rock, which I will take up to London.

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In upper alluvium fragments bigger more angular more slaty, estuary mud with glacier bringing fragments. Though non-stratified set in truth in one section seen to be finely laminated. inferior gravel seems often to be cemented by calcareous matter which has oozed from it. this may have protected shells. I cannot doubt the distinct formations

Sunday. Where road from Kingsland joins Coleham road a small quarry of pure sand, current

cleavage covered, though not markedly so by rubbish with many granite boulders.

The gravel which [man] said he had found many shells in, is on left side of road before

turnpike gate on Church Stretton road upper part great accumulation of horizontal slate

of pebbles like in pit on road near turnpike on Coleham and doubtful which series it belongs to.

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Wenlock Edge     Monday                       

in high land at foot of edge, gravel pit with the odd red syenite or granite much shale, I suppose from the Limestone shales or coal measures. Therefore Wenlock edge sea coast is Modern period.

On summit of edge some round balls (of size of [porpry] stones of greenstone therefore covered.

A [slickenside] of calcareous spar, with furrow inclined at only 10º with horizon. slate

themselves dipping at left angle in rather different point, therefore movement of body of rock nearly horizontal.

[There] in [suit] of specimens of corals and limestone (but seen when weathered) to compare with those from Kenley [L.D].

crystalling oxide of iron in concretions.

Corals most abundant in upper part?

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regular stratum, [submergence] deposit [shorl] water, near reef & some of the Rocks in situ, many overturned. [illeg]very muddy. No worm excavation.

[illeg] one block perhaps, some??? inclined[illeg]strata & Rocks of more solid [illeg] determined by [knoll] of living [cotel].

see Glen Roy note book for sketch.

Nodular structure. Not line of reef but elevation & coast line, within modern period. [has, crossed] caused the structure.

The aggregated portion somewhat resembles that of Isle of France.

as elevations are known to extend parallel to coast line of reef would often be broken up.

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Staffordshire. Madely no covering to the red sand.

pebbles perfectly well rounded, many of true granite,

(I did not note whether in lower part)

[illeg] great variety of rocks. also by Keel on right hand side of road from Keel to Maer. 

same kind of sand [illeg] gravel at Madely Chalk flints & those peculiarly drilled stones, which one sees on the sea beach.

The pebbles of Ashley heath & Maer heath, stratified come from this New Red sandstone. 

It is odd the boulders of porphyritic greenstone & granite which lie upon these beds how was it they were drifted there.

What is the level compare to Maer Heath?


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