Subject ASC0003sb2
The geological magazine, or, Monthly journal of geology.
[Decade 1]:v .5 (1868), Page 563 (1868)
California Academy of Sciences
BHL Page 36244695
Keywords
layer strata section gravel pit northamptonshire tufa deposit chara vulgaris mass paste calcareous deep incrustation surface soil stratified gravel gravel-pit Old Northamptonshire green alga tufaceous deposit