Smithsonian miscellaneous collections . of 1922 be devoted to the fur-ther study of the Franklin quadrangle and to stratigraphic studies incontiguous areas. Accordingly, the mapping of the Franklin quad-rangle was completed and data secured for the preparation of a geo-logical report upon the area, to be published by the State. Strati-graphic studies were then undertaken in the adjacent contiguous NO. 5 SMITHSONIAN EXPLORATIONS, I922 25 areas and some of the classic geologic sections of Central Tennesseewere visited and sttidied in detail. Dr. E. O. Ulrich, associate inpaleontology in the Nati
Smithsonian miscellaneous collections . of 1922 be devoted to the fur-ther study of the Franklin quadrangle and to stratigraphic studies incontiguous areas. Accordingly, the mapping of the Franklin quad-rangle was completed and data secured for the preparation of a geo-logical report upon the area, to be published by the State. Strati-graphic studies were then undertaken in the adjacent contiguous NO. 5 SMITHSONIAN EXPLORATIONS, I922 25 areas and some of the classic geologic sections of Central Tennesseewere visited and sttidied in detail. Dr. E. O. Ulrich, associate inpaleontology in the National Museum, joined in this work on accountof his life-long interest in the stratigraphy of Central Tennessee, andwith the aid of his assistant, Mr. R. D. i\Iesler of the U. S. Geologi-cal Survey, numerous detailed sections and about a ton of carefullyselected fossils were secured for the National Museum. The classic section at Nashville, Tennessee, in which the properdelimitation of the formations has long been in dispute, was studied. Fig. 30.—Section at Nashville, Tennessee, illustrating sequence ofOrdovician formations. (Photograph by Bassler.) with especial care and ample collections of fossils were secured toverify the stratigraphic results. The deep sea origin of all limestones has long been taught in spiteof the trend of evidence that many limestone formations were laiddown in shallow seas. The shallow water origin of limestone iswell illustrated in the section of Ordovician strata exposed near theblind asylum at Nashville which has l)een studied by several gener-ations of geologists. At the base of this section, as shown in figure30, is the Hermitage formation which was evidently formed along 26 SMITIISONIAX M ISCKI-I-AN ICDlS COLLECTIONS VOL. 74 ancient shore lines l)ecause it is composed of beach worn fragmentsof shells and other fossils. Above this comes the Bigby limestone, thesource of much of the Tennessee brown phosphate and which also ismade up almost entirel
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