Note 18 — Chapter IV · ON THE FORMATIONS OF THE PAMPAS.
Reading edition
In my “Journal” (p. 171, 1st edit.), I have hastily and inaccurately stated that the Pampean mud, which is found over the eastern part of B. Oriental, lies over the limestone at P. Gorda; I should have said that there was reason to infer that it was a subsequent or superior deposit.