Page:Transactions of the Geological Society, 1st series, vol. 2.djvu/231

Rh M. Brongniart mentions the following as being found in the various beds of the upper marine marls.

I have already mentioned that considerable difficulties appear to me to exist in assigning a place to the Woolwich beds. The actual lowness of their level, appearing to dip under the London clay, and their situation near the chalk without the intervention of that bed, at first seem to determine their geognostic position. Whilst the circumstances of their not being seen in any part covered by