RECORD: Darwin, C. R. n.d. Fossil Beds of Shells. CUL-DAR39.105. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.
[105]
Fossil Beds of Shells
In beds formerly quarried for lime at the Calera de Arriola – a little off the road from B. Ayres to San Isidro are almost entirely composed of an Estuary Shell ─ the Potomomya of Sowerby the living type of which is figured & described by Maton in the Linnean Transactions as now found at the mouth of the R. Plata:─ at the junction of the fresh & salt water from which these preserved fossil Beds are now say 150 miles intact.─
Proof that here was once the mouth of the River (above Buenos Ayres) ─
p. 20 of Pampas
Sonbonbon
Below
[105v]
{one of the specimens, [illeg] of more broken hulk of shells ─ crystalline-like Eutre Rios = P. Gordon
The others with rounded fragments like Potomomya ─ ⸮ mactra?
X++ {Are the S. Isidro shells in rock?? are said to be quarried ─
= localities given with specimens = Height
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022