. An introduction to geology : intended to convey a practical knowledge of the science, and comprising the most important recent discoveries, with explanations of the facts and phenomena which serve to confirm or invalidate various geological theories. first is an outline, being a side view of the upper jaw and teeth. Thesecond represents a front view of the head, with the two small cavi-. ties for the lobes of the brain, and the larger cavities for the orbits ofthe eyes. The length of the head, when entire, and clothed withscales and muscles, must have been about one foot; hence we mayinfer,
. An introduction to geology : intended to convey a practical knowledge of the science, and comprising the most important recent discoveries, with explanations of the facts and phenomena which serve to confirm or invalidate various geological theories. first is an outline, being a side view of the upper jaw and teeth. Thesecond represents a front view of the head, with the two small cavi-. ties for the lobes of the brain, and the larger cavities for the orbits ofthe eyes. The length of the head, when entire, and clothed withscales and muscles, must have been about one foot; hence we mayinfer, that the entire length of the animal was about six feet. Wheth-er this was the head of a young animal, or of an adult of a small spe-cies, cannot, perhaps, be determined. From the rare occurrence ofthe bones of saurian animals in the tertiary strata, we may infer thatthese animals whose remains are so abundant, and of such large mag-nitude, in the secondary strata, had nearly disappeared in northernlatitudes, at the epoch when the tertiary strata were deposited. The teeth and tusks of elephants have been discovered in manysituations, in what is supposed to have been London clay, but whichmay have been a covering of diluvial clay; for the patches of dilu-vial gravel that are spread over many parts of the Vale of Thames,frequently contain the remains of elephants.* Ammonites and bele
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Keywords: ., bookcentury1800, bookidintroduc, booksubjectgeology, bookyear1833
