PART I CHAZYAN AND RELATED BRACHIOPODS—-COOPER 1X 
Page 
NorthermbAckatisas {UL US Ui. cw awsic ec ne ge eam wan» MRR MeieIsialia oeiele nine syepenedies ig iy 
Everton-Jasper. forriationy 220 <<... elec e'eiein eas GaN ROMAN ho ee a Risi tla e «oe 117 
Correlation of Everton-Jasper formation......+++-++e+seerereresereceees 117 
Bless 1 gio ae Ls v0 Winn ay 9 se Sn IDENT OES epee Mie oe eye Fes e+ 117 
8. The Arbuckle and Wichita Wauntaiac, Oklahoma. itis riwsskehs «wilemsiee +e 118 
Joins: formation ea yscse. eases veers ess enone selenite ye[tes% 118 
Oil Greek FommmtionG vss og. sees a see tak aa py eee saben T° vine te * > 119 
Mekush formation os eh 55 <cunegeey see sees ssN ss yh TORE NTC eee o + 119 
Tulip Creek formation, .......<ss.2.+ 95s. ssemebinbeec et elteean sooo* 120 
Correlation of Tulip Creek formation..........+eeseeeereeeeeertrereee 120 
Bromide Formation. ov lols. «sees sia e seen enseasens ts: aeaebpe gy this * > * 120 
Mountain Lake member of Bromide formation. ......+-++++++esseeeerrees 120 
Pooleville member of Bromide formation.........+++eseseeerecreeerretes 121 
Correlation of Bromide formation.........+.+eeeereeerseeeectsrssetetess 123 
Wale TOLMIALION G4 sues Vel CRles ote save se oe eines we ehem hae NeeRarne oYn eG oe 2 123 
Womble (Stringtown) formation of Arkansas and. Oldahoma.).,...sjefce > => == 125 
g. The Black Hills, South Dakotas sso. ss% ss sc» gavatpleinsee ein sene® at biaisbiele te © © = oe 125 
WY Hike WOOG AOC TALON 1/005 seis slo: 80.0 0m eines pine Se are ciniaselerain ely’ miotuis, ici = © © 125 
10. The Great Basin—Nevada and California........s.esseeeereeesretereresceces 125 
Antelope Valley and Toquima Range........-sseeeeeseeeseecrecree resets esse 126 
Popomipyeroup J0leleee eek ess s ese e sss pase mt eee meaGs Van th ners 6555 126 
GPeled OBO LLCO CO eth sees ess 56504 vhs ss yee CBs ab baie st o> 127 
Pioche! District, Nevada (0.5 0450. .c0s seed. ccc c tte ge meee sa ss ae esas ckpes 129 
EP ceET IL SORMACIOMUGS Lc cad ucs 6uee Shh ache wks e "Fines oa. Sibsoes § ate o iaieis/0'/* 129 
California seis. PERO ORR ood Signa skins tsibe hs rs isin bat pie cases 129 
Miarcble MOrmMAuOn GTi sss ccc sek ess Fon be aes ols ayes oh aan ae See 2.04) - 129 
Barrels Sprite formations .)6.c5. 550+ ose00 bobs e ses Bae te A Ga Spaces: = s 129 
Rr HOrmatUlisiin Wedheeee cc cecaatve ese res es oe e ora ets seg siee oss aaah > oko sos >, 1g0 
bese bee NUEALITES ET OUNRR Tce ice L else ie sos ca eas aaaeas oe acer ges * 130 
Niorihcasterm Utaly Cee ete LLL S ee eles ee sees mais see aes s pos cree ce * 130 
Se Peake GUAT EZItecn NEL a Tes Dek lee tee ss be eee sae wae eae tae mec tt 9 130 
Peepion Vi) “Phe Waseiict cto CC Sem Ps i ial cae ois sie a tye 8 cae mie te a cee alc 28 131 
General discussion of the fossils... 0.2... cece eee eee eee een cece nce c cece cers 131 
Concept of family atid genus: i) iif silicic eee eee eee ce epee neem nese recess 131 
Shel geretite \ATONR SCENT SEAL ELLTEI EEL tlie tessa ssp a es Sapa sge scapes 131 
TALES Tae NORTE TRUE SHES ASTI SNES Poetics seca tas ae es sas 0 132 
serene PATIO ORSDELEPTEDES II SE ST Soh eer es ees sew get sae tee 78s 132 
PPE DEREL E, PESUME TRONS eee eee eee ae aaa ea tae 133 
Annotated list of genera and species........ 2.5. c cece cece e eect etree tees nets nce 138 
bclacey WGastrocailiane tease hess athlS ch ligh sith Sel a meee sce ew ess asses 187 
Superfamily Dictyoninacea : 232.22. 022s. ssh beets esse eee ge een eens ee ger ees 187 
Paniily) Micromitridae’): 2. iss. kstsss cise i i ees ase ce ee ee tastes 187 
Oe oe eo Re lac ang aM RES IIE Se a SC ICICI SCC cA I ae 189 
Gupenimily @bOlaces els s; 2s fst Ass singe Teh eee Sees sae g ress: 189 
Bagig Obolidacwt nt Oese Sheek tsar Teste steers me se coe sos ss aes ° 189 
Suibiannly OPOlAae’: ses 555i82 sh TI2 sss eevee eee ares oan ges ss oes 189 
Subfamily Lingulellinae: ¢2.:s...s2 6 eee eres. nee geese ele ase ees 195 
Subfamily Acanthamboniinae ........-...se sees eee cece e rete tence eees 2iI 
Subfamily ‘Glossellinae «: is... .ci cite ccs e sete cess e eee e ees c cece ce es 213 
Superfamily Trimerellacea ........:..0eee seers reese eee eects eset se ceeees 229 
Family ‘Trimeceliidae: os: 2 iss 2sia52 si: 5. DOSES a aes ee cles ele one * 220 
Family Lingulasmatidae::..:.2:2s2.222 55. beer reece eee cece a cee ce rene 232 
arly Paterabidae 1)... oteees esse sige enneneceeesoee es saweske ese ee 236 
