. A second visit to the United States of North America . Scale one-sixth the original. Slab of sandstone from the coal-measures of Pennsylvania, with foot prints of air-breathingreptile and casts of cracks. Chap. XXXVII.] FOSSIL FOOT-PRINTS IN COAL STRATA. 231. Series of reptilian foot-prints in the coal-strata of Westmoreland County,Pennsylvania. o. Mark of nail ? 232 FOSSIL FOOT-PRINTS IN COAL STRATA. [Chap. XXXVII. (Tringa minuta), which I saw running, in 1842, over the redmud thrown down by every tide on the borders of estuaries con-nected with the Bay of Fundy. When this mud, which extend
. A second visit to the United States of North America . Scale one-sixth the original. Slab of sandstone from the coal-measures of Pennsylvania, with foot prints of air-breathingreptile and casts of cracks. Chap. XXXVII.] FOSSIL FOOT-PRINTS IN COAL STRATA. 231. Series of reptilian foot-prints in the coal-strata of Westmoreland County,Pennsylvania. o. Mark of nail ? 232 FOSSIL FOOT-PRINTS IN COAL STRATA. [Chap. XXXVII. (Tringa minuta), which I saw running, in 1842, over the redmud thrown down by every tide on the borders of estuaries con-nected with the Bay of Fundy. When this mud, which extendsover thousands of acres, has been baked by the hot summer sunof Nova Scotia, it shrinks and cracks to the depth of severalinches or even feet, and acquires such consistency as to be divisi-ble into the successive layers of which it is composed, presentingon many upper surfaces impressions of birds feet and cracks, andon the under sides the casts of the same standing out in relief.* I have also stated f that on the sea beach near Savannah, inGeorgia, I saw clouds of fine sand drifted by the wind, filling upthe foot-prints of racoons and opossums, which a few hours beforehad passed along the shore, after the retreat of the tide. Thisprocess will account,
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