85 
APPENDIX. 
No. I. 
Ir remains to offer a few remarks on an interesting feature of our marls; I al- 
lude to the abundance of Lignite and Amber, (Succinite,) contained in some of 
them, especially in the lower mass of strata traversed by the Chesapeake and De- 
laware canal. 
Lignite was at one period considered to be indicative of Tertiary formations, 
but it is now frequently recognized in the green sand of Europe: and as analogies 
in geological arrangement in remote parts of the world, are both interesting and 
instructive, a few instances may be adduced to illustrate the point in question. 
M. Boiie informs us that the marls which alternate with the ferruginous and 
green sandstones, (grés ferrugineux et vert,) below the chalk in the south west of 
France, contain beds of Lignite.* M. Botie further remarks that Lignite and re- 
tinasphalt characterize the green sand formation (craie chloritée) at Obora, in 
Moravia. In allusion to these Lignites he says :— Ces bois montrent qui’ls ont 
été longtemps sur la rivage de la mer, puis qu’ils sont couverts d’huitres et de ser- 
pules, et qu’ils sont percés de trous de Tarets (‘Teredo) qu’ont remplis posterieure- 
ment par de la pyrite.” The last two circumstances are common to our own 
Lignites. 
Humboldt, in his “Tableau des Formations Geologiques,” gives as a synonym 
of the Ferruginous sand series, gres secondaire a lignites, in contradistinction 
to his gres tertiare a lignite, or Piastic clay formation. 
Cuviert describes the green sand of France as containing both Lignite and 
Amber, the former being abundant in the strata between Dives and Fecamp. 
Another remarkable instance occurs in the green sand of the Isle d’Aix, near La 
Rochelle. At this place is a submarine forest of dicotyledonous trees, sometimes 
bituminous and brittle, and again having the texture of jet. These Lignites are 
perforated by the Teredo, and accompanied by Amber.t 
The lower divisions of the Green sand of England contain considerable quanti- 
ties of fossil wood, and even regular beds of wood coal.§ 
* Ann. des Sciences Nat. tom, iii. p. 309. + Discours sur les Revolutions &c. p. 294. 
+ Humboldt, Gissement des Roches, p. 294 and 297, § Conyb. and Phil. Geol. p. 137. 
