PLAXT-BKAKIXG OUTCROPS. 55 



Jolinson roforrod it to IIil<i;anrs " MaiisfioUl and also Harris were inclined to consider it 



series" (Wilcox fonnatiou) ; Lerch to his "Lower Claiborne"; but recently Harris has 



"Lowin- Lii,nulic," whicli is ]iartly Wilcox and considtu-ed it as Wilcox, whicli is inuloubtedly 



]iartly ('lail)orue (St. Maurice fonnatiou); its c()rrect age. (See PI. V, A, j). :>9.) The 



Vaughan n^ferred it to the ''Lignitic"; Veatch section is as follows: 



Section at Slauglitir I'tn Bluff, Shnveport, La. 



Feot. 



1. Jledili.-^li loam, firadiuf; dnwii into ycllowisli artjillareout* aii<l .'^(imewliat calcareoius .sand 8 



2. Buff sandy ilay wilh a ft-w mvM bivalvi's ( l.fda, Maclra, an<I tlin like) and Kcaltorfd leaf 



impi'cstiions 5 



3. Laminatod brown tlay and buff Kind wiih fiTnifrinou.s concretions toward llio toj) 10 



4. Dark lignitic cluy 2 



5. Lignite 2 



f). Gray and buff laminated sand.s and thin lanuiue of bhii.sli clay wilh a lew leaf imi)ressions anil 



more or less comminuted vegetable matter, e.vposed about 17 



Few fossil ]daiits occur in this section, and Tlie Joliiisoii collections from Cross Bayou 



these as a rule are pooi'lv ])reserved, as seems came from an old quarry known as Campl)ells 



to 1)0 the case with all tlie remauis of this sort (juarry. The matrix is a well-lit liified gray 



around Cross Bayou. A small collection made sandstone. These forms were tentatively de- 



by Veatch was reported on by lloUick ' in 1!KX). termined by Lesfjuereux and tlieir critical 



I visited this and neighboring outcrops in 1911, revision furnishes the following hst of sjiecies; 



but saw no fossils worth collecting. I have Ki,us denveriana. 



had access to the original collections inaile ]\y Fif us harrisiana. 



Joluison iuid d((termined l)y Lesquereux,- liicoria antiquorum. 



wliich are now in tlie United States National Mospilodaphnc i>sendoglauca. 



Museum, as weU as the Harris and Veatch col- Ne<tan.lra lancifolia. 



, ^ . 1 . ,1 XT A' 1 11 i • 1 Khamnus cleburni. 



lection, preserved at the New \ork Lotaiu<-al Sapindus formosns. 



Garden. Temiiualia hilgardiana. 



The following is a revised list of tlie species \ ; -i i , • i • 



..." 'A similar gray sandstone is exposed in a 



iroin this outcrop: „„, r +i t- n-. o ^i o -i 



' cut ol the Ivansas City Southern Kailway 1 



Cinnamomum postnewberryi. mije yvest, „f slireveport and oidv a short dis- 



Cyperiies sp. ^.^j^^.^ south of Cross Bavou. It contains 



Ficus ])laiiicostata maxima. . . • . 



jlgxsp much Iragmentary leaf material, among which 



Poacite'sep. Sapiii/lus iiiississippiensis Berry has been 



Vineyard Bluff, about half a mile above recognized. 



Slaughter Pen Bluff to th.- west, on Cross coush.vtt.v, red river p.vrish. 

 Bayou, is an outcrop similar in lithology and 



stratigraphic position. A collection of fossil Kt'd River has impinged on the Eocene beds 



plants procured from this outcrop by Harris nt Coushatta, where they are exposed in low 



and Veatch is now at the New York Botanical bluffs along the left (east) bank from a point 



Garden. The following species are reiiresented: below tlie town to Coushatta Bayou, three- 



. , 1 ■ ■ eighliis of a mUe above the town. The fol- 



Arlocai'ijus lessiijiana. " 



Cinnamomum ]),)stnewl,en-yi. lowing section IS taken from \'eatch and rei>- 



Ficus harrisiana. resents the condition in 1S9S, when the bulk 



Oreodaphnoobtiisifolia. of the fossil jjlaiits were collected. The river 



Pteris pseudopiniucformis. j^ rapidly eroding these cliffs, and they are 



There are several deep wells at Shrevejiort gjii,i tg ji-^ve receded about one-fourth" of a 



whose records are incomplete, though they „,ii,. h,>tween Veatch's visit in 1S98 and niv 



are discussed by Harris in comiection with visit in 1911. The section exposed at present 



the numerous de(-p-we]l n^cords from the near- j^ substantiaUy tliat as ipioted below, except 



by Caddo oil field. Tiicy show a thickness of ^j^^^^ ^j^^, ij.o,^ concretions are inu<h poorer in 



WUcox sediments in northwestern Louisiana pj.^,^^ remains. I split open all thai were e.x- 



oi about 450 feet. posed without obtaining anything noteworthy. 



> HolUck, Arthur, Louisiana Oeol. Survej- Rcpt. Jur IMfti, pp. 27o-.'>s, ihc SCCtlOll IS aS loUoWS: ' 



pis. 32-lS, I'.IOO. 



2 Lesquereux, Leo, U. S. Nat. Mus. Proc., vol. U, pp. 24-23, 1888. ' Veatch, A. C, op. cit., p. 200. 



