Licence: In copyright
Credit: Gastroliths. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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Licence: In copyright
Credit: Gastroliths. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
![[Reprinted from Scienck, N. S., Vol. XXV., No. 628, Pages 66-67, January 11, 1907.] GASTROLITHS In extension of a recent note by Mr. Geo. L. Cannon on the occurrence in southern Wyoming and Colorado of sauropodan gastro- liths1 similar to those first reported by me from the Big Horn Mountains/ I wish to state that a recent search through the Yale collec- tions has not revealed any further examples directly associated with Dinosauria. Meanwhile, however, I have been shown, by Mr. Bamum Brown, four additional speci- mens obtained in Colorado in proximity to various dinosaur skeletons. These gastroliths are very highly polished, and it is noteworthy that one of them contains a fine bryozoan and traces of other marine organisms identically similar to those noted in one of the examples from the Big Horn Mountains. In fact these specimens are so entirely similar in both tex- ture and the fossils contained as to make it quite certain they were derived from the same source, namely, a marine formation contain- ing siliceous nodules in much the same man- ner as the English chalk cliffs—or to cite a somewhat different instance, certain moss agate-bearing carboniferous terranes of the Laramie Mountains. Nor is it improbable that the original source of these fossil pebbles may soon be found, and 1 Science, N. S., Vol. XXIV., No. 604, p. 116 July 27, 1906. 'Ibid., Vol. XXIII., No. 595, pp. 819-821, May 25, 1906. *](https://iiif.wellcomecollection.org/image/b22407443_0003.jp2/full/800%2C/0/default.jpg)
