Stratigraphy ofI&tti&a\s ferMm^eedPand Sellards. 107 
head considered number 1 1 of his section as Permian. This 
corresponds ro ; number 5 of Prosser's section and is consid- 
erably below the base of our section. At the time Prosser's 
paper was written the Cottonwood limestone was considered 
the base of the Permian. He correlated number 17 of his 
section, provisionally, as J ¥he' ( } y €ofton\v'o6d limestone and 
number 18 as the base' of the Permian. Thi¥4s f: stm^e?6 r w J 
rife ba^bfo^ufifeecH^ti! 10 ' 77 ^modz ,noi 8 ri 3 *x9 tnsdiuoz 1 
X v£ ^nk& on'e'tfa^een'lne sect&n^t^eaWm: oVtn'e one 
from£^r?efteSn^B'ttTH"e^^PWd«!d be difficult to get'tnfe 
proper understanding of tile Grand Summit section. Broad- 
nfflPrtdtej^flFmiHte %\onpmdk¥\m cr deBtihri-W<m 0rd^ 
r)fld^?<t8 K&Vfferf/'^nlPsnBilftf^l^e given it the proper inte?- 5 
r^ti'om^™^c^i9e^ Grand Sttm^ 
rn?f?^q^a^^%« r,i ^Jift^!lft»' b e^a^eht and 'ti&kSMS 
tWeqmmM ^fir&k faWftP^^tf?^^ ^faPfesMnf 
farther nortK? S8 S#e¥& ^$tafiWufiffi J %* tn# eVf Or. I n 
the firstvprferc^xbrJiHWAtGmesicjfethe lyamsofrtfowtiatiafi have 
secondly, the opposition .of the headsoorfecajUsiero-lapg© stffSamir 
on either side* of the escarpment W^^ended'io iWcr^aWe the- 1 
hight ot its eastern face and at the same time nas w remQve'd 
, " " £ , . r ~.... t . M L319VOD . X 
the ..upp^er. strata completely. At Grand SummJko}he r jthiclf 
limestone, -by |he upper, cut,, weathers. strikingiy^[HJ*e, the -less 
cherty poftioitJ . of the Wreford limesterree^n^ThWrflini^fon-e 
is represented^ number 28- of Prosser's section ne^r tfife 'tor| 
of rmmberj_ot Bt6adhead,'ahd is number '25 of our §e^tjori^ 
Number, 28 o^ £rosVerj • t&eifJBgffigSBlii &X(^»W»SbSW0Qse<f 
t o be the foss i li ferous horizon in the middle of the Wreford 
Imwbstbne/ias Q#t Council- Grove and some other^localities. 
Number 28 of Prosser's section is equivalent to number 29- 
ofVJufl:- ^MffltefM'&fafil fefeS X' ntirnners 
2^tn^ ^f^8u*fra to^efV?* no 3 ™ 2 °<l x3 ^ T >™ noitennol 
^Porn'^rafe^ 
lifflfetfeftfe WteW^al'feriW^SnfHit tfn&W Wreford 
HiSfec^^^^a^tfpflfeff^afWs^lWtVfiw it. gS 
pretation of the stratigraphy is very important J55 ttoe^al^On- 
