...described, can be determined only by further investigation. But the discovery in them at Baltimore, by Prof. Tyson, of stumps of cycads, would seem to bring them into near relation with the formation of Fredericksburg containing similar remains, and to favor their being referred, at least in part,...

...continuation of the Virginia formation above described can bo determined only by further investigation ; but the discovery in them at Baltimore, by Professor Tyson,...at Fredericksburg containing similar remains, and would favor their being referred, at least in part, to the horizon of the Upper Jurassic rocks. Possibly...

...described, can be determined only by further investigation. But the discovery in them at Baltimore, by Prof. Tyson, of stumps of cycads, would seem to bring them...upper Jurassic rocks. Possibly we may find here a passagegroup analogous to the Wealden of British geology. Whatever may be the result of further discovery,...

...deseribed, can be determined only by further investigation. But the discovery in them at Baltimore, by Prof. Tyson, of stumps of cycads, would seem to bring them into near relation with the formation at Frodericksburg containing similar remains, and to favor their being referred, at least in part, to...

...continuation of the Virginia formation above described can be determined only by further investigation; but the discovery in them at Baltimore, by Professor Tyson,...at Fredericksburg containing similar remains, and would favor their being referred, at least in part, to the horizon of the Upper Jurassic rocks. Possibly...

...continuation of the Virginia formation above described can bo determined only by further investigation; but the discovery in them at Baltimore, by Professor Tyson,...bring them into near relation with the formation at Kredericksburg containing similar remains, and would favor their being referred, at least in part,...

...Delaware and Maryland, but in Virginia disappears in its eastward dip beneath the Eocene tertiary. stumps of cycads, would seem to bring them into near relation with the formation at Frederieksbnrg containing similar remains, and to favor their being referred, at least in part, to...