A Studji of flic Jiel»:i(lere Beds. — Craijiii. 371 
Common in the upper (^K at lea pedernalis, Cypriiia fe.caiia 
and C. roerneri) beds of the Bosque and in (especially the lower 
and middle parts of) the Fredericksburg : Exogyra fexana* 
Known only in the Fredericksburg: N'et'eis inGO(jnlta.,\ Vola 
occidentalis, Tijlosforua tnHiida and the typical variety of 
Spheriodiscus belriderensis. 
Not recorded from the North Texas area: Pllcatala incoit- 
grua.'l 
Almost exclusively a Fredericksburg form, but ranging up 
into the basal (Duck Creek) part of the Washita: SchJoen- 
hach ia peruvian a . 
Common to the Bosque?, Fredericksburg and Washita: 
Modiola sfonewalleiiHis (^=^c(> ii re )t f rice-costen afa .' ). 
Common to the Bosque'?, Fredericksburg, Washita and I)en- 
ison : Osfrea siibovafa. 
Common to the Fredericksburg and Washita?: Tn'no/n'a 
(iinoriji. 
Probabl}^ common to the Fredericksburg, Washita and Den- 
ison : Cucullwa recedens, Ciipri iiicria fexana. var. kiovaua and 
Plwladomyo sanctl-saha'. 
The fact that Griiphwa Inlli is strictly confined to the lower 
and middle Fredericksburg, occurring at AVeatherford as low 
as certain sandy marls which there constitute the base of the 
Walnut beds and ranging through these beds a considerable 
distance up into the Comanche Peak limestone proper, indi- 
cates that the Champion shell-bed should be referred to the 
Fredericksburg division and i)erhaps to a iiorizou not liigher 
than the middle of that division, a conclusion tliat is quite 
consistent with the other data above given, including the 
mingling which this shell-bed presents of some fossils belong- 
ing to divisions respectively higher and lower tlian the Fred- 
ericksburg. 
THE KIOWA .SHALES. 
The Kioira ■s/iale.'<, or Comanche shales of the lielvidere beds 
above the Champion shell-bed, are black, blue and gray argil- 
*See also remarks on this species under Kiowa shales. 
tThe writer has collected this fossil in the Walnut bed at (iabriel 
Mills, Williamson county, Texas. 
JRecorded in Messrs. Dumhle and C'ummins' Kent section as occur- 
ring in a terrane below the main Fort Worth iEpia.'^tcr cleydiis) zone of 
the "Washita" division ( the Kont zone). 
