1891 edition.: .made by the writer, but in part it has been compiled from data furnished by Mr. W. F. Cummins and from publications of Mr. R. T.

Hill. It is believed to represent correctly in a general way the formations of the eastern part of the Texan region, but it does not include by name the two members which have just been referred to as occurring in western Texas.4 The line upon which it has been traced extends from the western part of Parker County to the eastern part of Navarro County, its direction being approximately northwest and southeast. This line also approximately corresponds to that of the general dip of the Cretaceous formations which lie upon the eastern side of that portion of the Great Interior Paleozoic area which extends southward into the Texan region. 1 See White, C. A., On tbe relation of the Laramie Group to earlier and later formations. Am.

Jour. Sei., 1888, vol. 35, pp. 432-438. The characteristics and relations of this formation will he discussed on following pages. 3 These beds must not be confounded with the Eagle Ford formation, which belongs to a lower stage of the Upper Cretaceous. The similarity of the latter name with the former is unfortunate, but it iB thought best not to change either of them at the present time.

It should be borne iu mind that very little has yet been published in the way of mapping and measuring the Cretaceous formations of the Texan region. It is therefore to ho expected that when such maps of the region are published some modification of the account here given of them will be necessary. Fig 6.--Section from Parker County to Navarro County, Texas. 1, Lignitic Beds (Tertiary); 2 Ripley formation; 3, Austin formation and "Ponderosa marls1; 4, Eagle Ford formation; 5, Timber Creek formation; 6, Comanche series: 7, Trinity formation; 8, Carboniferous. In this figure all the formations from No. 1 to No. 7 inclusive are represented as being strongly unconformable with the carboniferous; but I.