PI.AXT-r.HAKIXO OUTCROPS. 



45 



I.A CKANOi:, KAYKITE COUNTY. 



The ui)l;in(ls (if holli sides of Wolf River in southorii Fav<>tt(' Couiil v tuc all cxtciisivelv 

 {2;ullic(l anil show V(>ry similar sections. Ininieilialejy sovilli of tiie town of La Grange (seo PI. 

 ^'l. />l the foUowin<; section is o.xpdscil: 



Siclion of }>(ds of Wilcox agt soulli oj La drunqi , Ttnn. 



Feel. 



1. Soft, Idd.so lijjlit-yclldw to li;j;ht-c;ray sands, c-ros-s-boddpil 15-18 



2. Layer of soil, dark with orijanie trial tcr i li<;iiitic sand ) 1 



3. Ma.ssivo Ix'd of brick-re<l .sand, easc-liardeiied: sliows very even top but very irregular lower 



.stirfaeo and rests unconl'onnaljly on the underlyins; .sand '1-15 



4. Soft cross-bedded sands, mostly fine but in places coar.sc, of li.i;ht colors, such as nearly 



white, light ytdlow, faint pink, and faint jjurplish. eoniaining a few thin crusts and small 

 rounded or .short tubular c.incretions of sand irou.stoue in ])laces. Near the to)> there is 

 a clay lens of irregular .shape S or III feel in maximum thickness 100 



In some of thi^se sections Ix'lwcen Grand 

 'luiielion and La Graiiijc tlie g'"ay sandy clay 

 (of Wilcox a<^e» constitutes the tip])cr ineinlicr 

 and is nnderlaiii liy tlie coarse, ci-oss-heddeci. 

 and casc-iiardcned l)fown sands (so-called La- 

 fayett(^). In other sections those sands lie at 

 the top and reach a ina.Niinnin ol)sei've(l tliieix- 



Is nesri of 25 to oO feet. I fail to 



linil 



any e\i- 



<!cnco in Fayette or Hardeman counties of aii 

 interval of erosion commeiistirate with the 

 supposed interval representing tiic time inter- 

 vening between tli(> lower Eocene and the 

 Pliocene. Li fact there is no evidence of ero- 

 sion exce])t tlie fancied evidence common to 

 all sliallow-water deposits of this sort where 



The lower ])art of tlie section was iiiciiuh'd 

 by McCiee in tiie so-called Lafayette formation, 

 which throughout northern Mississip|)i and 

 wi^stern Tennessee lie considered as nsnaily tri- 

 partite, the upper division l)eiiig massive case- 

 hardened loamy iirick-red sand and tiie middle 

 and lower divisions l)eing softer lirightcr-coloriMl 

 sand, c-onuuonly carrying clay houses or be( 

 containing impressions of leav(>s. He would 

 place tlu' lower 100 feet of tlie above section 

 in tlie middle and lower divisions of the La- 

 fayette and regard the entire Lafayette at La 

 Grange as 200 feet or more in tliickn&ss. 



Glenn ' considered that beds Nos. 1 and 2 

 represent the Columbia, No. 3 the Lafayette, 

 and No. 4 the Wilcox. In my judgment only clay lenses of different sizes are inclosed in 

 Wilcox materials are present. This wtus th^ sands of varying lithology and bedding, 

 type locality of Safford's Lagi-ange formation, About halfway between Grand Junction juul 

 anil his early coUectioixs contained the follow- La Grange, Tenn., near tlic eastern border of 

 ing plants: Banksw saffordii (Lesquereux) Fayette County, 1 J miles west of Grand June- 

 Berry, lUiamnus margiiuitus Lesquereux, Ter- tiou, a soutiierly sloping hillside inimedijitely 

 minalki Itilgardiana (Lesquereux) Berry, and south of the public road is incised with old 

 Zizi/pJiiis wngsii (Lesquereux) Berry. I am gullies, now almost entirely covered by a growth 

 able to add Euonymus splemlens Berry as a of scrub. The section is not well exposed but 

 result of my visit. Impressions of leaves are proljably does not dillVr materially from tiie 

 as a rule scattered and poor. section at La Grtinge. l\i -.i small stream clian- 



About one-fourth of a mile west of the town nel a brownish-drab laminated plastic chi}' 

 sand is quiirried from a large open ])it that W(>11 carrying well-preserved impressions of leaves 

 ihustrates the extreme lateral variation of the is exposed at intervals from 10 to 20 feet below 

 materials of Wilcox age. Orange sand; iron the level of the road. Tiiis same clay lens a p- 

 crusts; drab, somewhat lignitic sands (Glenn's parently extends upward to about 8 feet above 

 "old soil layer"); and pinkish sandy clay with the level of tli(> road and is overlain by 2 to 

 leaf impressions occur at aU levels and replace ,3 feet of brownish or reddish sandy loam, 

 each other within short intervals. Just west of L. C. Glenn made a collection here in 1905 and 



the sand ])it I obtained the following section: 



Section of hcfh about onc-fourtli mile nest o/ La Grange, Tenn. 



Fcot. 



1. Brownish sand grading into next member 20 



2. (iray sand 5-8 



3. Yellow ferruginous argillaceous sand 10 



4. Gray sandy (day; about 10 



1 Glenn, L. C, op. cit., p. 36. 



I made several collections in 1910 and 1913. 

 The forms itlentified from these collections are: 



Anaearditew serratus. 

 Aristolochia wilcoxiana. 

 Banisteria wilcoxiana. 

 Banksia saffordii. 

 CiBuoinyces annulata. 

 Caenomyces ca.ssia.\ 

 Cassia emarginata. 



