Correlation charts made from electric log data show the relationship of Ordovician and Silurian strata in eastern Montana. The Silurian sediments terminate westward in eastern Montana, but the Ordovician sediments are present westward into central Montana

Lanphere, Marvin A.

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Montana Tech Library Digital Commons @ Montana Tech Bachelors Theses and Reports, 1928 - 1970 Student Scholarship Spring 5-20-1955 Correlation of Ordovician and Silurian Formations of Eastern Montana Marvin A. Lanphere Follow this and additional works at: https://digitalcommons.mtech.edu/bach_theses  Part of the Geological Engineering Commons r b ch I I I I Tr, T by vi L n here i C 0 I 0 s ct 1 nt C 1 3 3 5 0 0 0 5 9 0 . 0 2 I u T V 0 0 0 C 0 0 0 0 0 C t 0 , 0 0 0 oc 0 0 0 0 C 0 0 0 0 s 0 0 0 M~NALLY LOOSE LEAF OUTLINE MAP ._. COPYRIGHT BY RAND MCNALLY I COMPANY.CHICAGO ___ PLATE MONTANA·-\ i ·1~ i j :~ _;!°'--  t- . . I . I 0 . 0 ."".- 0 In 0 . 0 .., 0 N 0 "' 0 T y Ordovician Te b s 1 r ovici n fo rnation int e illiston B sin is th i nipeg owling (1 6) -lithology o th tion, origin·l y e ined by i p i se n e. cont in loc lly. p oble e sts in tion 0 t me t·one 1 i s to to fa ley et _1_ (1 54)» the or tion is s follo s: ith verl reen shale er s unit. ay Tin li estone eds t onstitutes t e estern term- g orm tion. T1is p oble o t. In the el ·11 be th in fo 0 is es. nt ·ts t C ness n es up to 273 to The e i e 0 ion s very i s re n is one of th mo t ions n h i 1·ston , sin o It 0 oe t (1 29) 0 u i lo s 0 g, 0 1 'In 0 b op to bo 1 irk 1· sto s 0 I.n th sub ·s C 0 t 0 s b tr 0 t no 1 0 V 0 - 0 co 0 is not se i t orrt., n· o Th 1· olo 0 t ver or at·on is 'Thick be d C rst lli e to r g nt 1 limeston s nd olomites, so ti s s 1 i b s·l it an 0 ten san to C rty in medi 1 it" et --1, 19 54) • In th ells cov ed by thi re 0 t' h e iv om tio ran s i t ic ness r 0 to 1 t. ro 0 0 est 0 0 L e i p g, Do li (1901) ori i lly n t Sto ount· in fo m· t·o . t o tc op t e Stony ount 1 o m't·on has en i 0 e b., . Th to oun a·n sh le is the b s 1 b olo ·te s t e dial ember, the u m er Th SU V sio 0 0 0 · tio ot g n r-:- 11 se 0 te m G 0 is occ sion- 11 1 t s 0 0 t bout t ,,, 1 C 0 n s it rob 0 ·1u no " C 0 on m mbe y t tl 0 0 ed n s 0 0 0 0 0 0 tony 0 0 0 0 0 0 0 y h 1 0 1 0 t s e b d ·t rk bro n to bl C 0 1 s ' y t 1, 1 5 ) . T orm·tion V u 0 i 0 0 to 10 t in most 0 t 0 t, it C s ction 0 1 s e 0 e t· li eo 0 S 0 1o to t I 1 b 1 (1951) 0 0 0 s n o 0 C 0 0 u 0 OU 954) Ho ver, int e co rel t·o1 ch rts ( 1 tes -4) only the normal curve ad t e 1 te o inverse curve h ve been lotted. This pr c .Lve s a o te or uni orm·ty becau e, in several cases, th set o curves ere ·the only resistivitr measurements ade on the ell. 1 o g the spot neou ote tial curve is co monl i cl e i electr·c lo cor elations, the writer omitte t e . . cu ve 1n t s tudy because, n ost C ses, it s owed ins C ent C C er to be val e in correlation. T1 to OU t in or tion ( rdovici n- ilu i n boun selected b· se 1·n or the corre- 1 tion sect·o S9 C t e on 0 nt 0 tion is the most uni or consis en o m tio involve in t i s t udy, t e to 0 e 0 0 t i e 0 ic 1 to use s b se 1· e T ost 1C pect 0 t e 0 C cosing ele tr C lo b u s a C "topsn. ct· C 0 es e n th t i 1 0 le t 1 0 . t·nct 0 e t C 0 t 0 s n s co y. 0 0 0 s ist·c e 0 0 e 7 0 0 1 I 3 cor el io C I) ' n en el -/1 ell 7, co el t II) • T e · se 0 e 1 e 0 tion s cle rl e ined e C C t e top 0 the mbri n sect· s un·t i t e 0 t e i n e o m t·o 1S n 1 t g rom t e ess 1 0 t e 0 mb n ol 0 C C e 0 t·on s J s C u s e io 0 0 0 e t 0 ole 0 0 I) ' C I ( 5 ) ' 1 en I I C ·st·c C 0 0 C C 0 0 0 0 0 0 ho ver, t e 0 n ai - ed V bou i ·cult to ete mine b C se t e Ie i t·v·ties 0 the 0 0 m tions re co b e C cte istic curve is ot ro ucedo Occasionall e l it cu ve r in t e on ~Iount in- Re Riv OU y be r V se . at is, he top o the R ve 0 e d b u ic ' 0 he le t inste 0 i eve s 1 ca be C se by a C nge i 0 t e r·11· e ct 0 t e 0 10 's conn e 0 eve ' co 1 s bee u e e i tic cu ve of iv ·1 be ormed t OU h V s 0 . 0 0 t 54) Y, " 0 0 ot op bottom 0 s s 0 e 0 t ton e 0 t 0 0 1 0 0 s' 0 co r o i Ly C 0 0 I 1 e- l t C' es, 0 C 0 h C 0 0 eep tes s e s e in u ber d i el se r tedo onseque tl t ion s d int is re 0 t or co lat·on r OS s s not s et iled s he ' iter ould y co 0 s 0 le ert' i co cl sions ve C se V t·o s C be de 0 0 ts 1 t - ) 0 ese co cl sio 0 s t t ( 1) 0 0 0 0 ov ci n l il i s s s 0 by 1 s e 0 en tu t OS s n eg 0 0 e ony 0 0 0 0 0 t·on s 0 y 0 u 0 0 0 0 0 0 0 0 C t·c e, s ell /11- 3 ( el co el on c t I) ell i t t.Le e /33-3 ell 7, cor el t·o C ) . ic e e e to s UC 1 0 0 e to 0 e o t e e st 0 e o t, th C 0 0 0 0 0 e 0 0 3 , C t he 0 0 C 0 t co 0 5 C ) ' 3 s 0 0 CJ. 0 0 0 0 0 IBL y ines 'n Dowli g, D. B., 1 96, Vol. 11, p. 67-6. at. lub T 1 95-96, -' 1901, of L e Vol. 1 Foerste, Hadl e i 46 1 29, o t e eol. nd Isl nds Report, Univ ~-, Vol 2 , o. 2o os en o, sin PLATE 4 7 CARTER GOU TY ca er co. Traweek .#1 G- N-GIE LE BEA JER FIELD S e I Oil Co .. Litt e B a er -#33- 3-4N-6IE 85 0 9000 vertical sea e 50 800 .... : : . · .. , . 400' 850 30 ' ) ..... . .-·c ·: . .... . ·· .• M •• •· .... ··: .. ·· . . .. ~ .. .. .. ... . ·.".•.· ) ..... . ... . . . . ... .,,,,.,.,,.,.,, .• ~ _ •··c ...... ·:• .. .. . .-.:::.=.~·- C .. •· ~ .. . ... . . ... • < . . .. . ·· .. . .. . . ·.~ . ..... :-:----- ····~ ) · .. ~ · .. _: ·. ·_ . - ... . . ) 200 00' 0 

Correlation of Ordovician and Silurian Formations of Eastern Montana

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Correlation of Ordovician and Silurian Formations of Eastern Montana

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