Page:Narrative of a survey of the intertropical and western coasts of Australia, Volume 2.djvu/650

 they cross the direetion of the strata, and be made, by eareful exnmination,'to aord instructive seedons. ?. S}kmong the distinefive circumstances of the strata, the remains of ornized bodies,--shells, corals, and other zoophytes,--the bones and teeth of animals,--fossipe wood, and the impressions of vegetable stems, roots, or leaves, e., are of the geatest importnnee; affording enerally the most marked eharacters of the strata in which they oeeur.mThesc should, therefore, be 'particularly sought after, and their relative abundanee or nuity in ditferent situations noticed. The petrified bodies should, if possible, be kept united with portions of the reek or matrix in which they are found; and where they are numerous,---in sand, clay, or any moist or friable matrix,--it is in gnsrai better to retain a large por- tion of the whole mass, to be examined afterwards, than to- attempt their separation at the time of colleering. 8. The ose  which are found above the solid roeks, in the form of gavel, silt, rolled pebbles, -c., should be earefally distinguished from the sold strata upon whieh they repose. And the'more ancient of these loose materials, found on the sides or summits of hills, c., sho uld be distin- guishod. from the recent mud, sand, and gravel, brought down by land-floods, or rivers. *The benes and teeth of animals are not unfrequently found in 8Tavel of  former description  and the collection of these remains from distant quarters of the globe, is an object of the greatest interest to geolo. 9. Besides a note of the !oeaiity, there ought, if possible, to accompany every specimen, a short notlee of its gological circumstances; as--- WJmther it be found in large shopeless masses, or in strata ? �o.. II. S S

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