Foraminifers and conodonts in the Visean deposits of the Lublin Upland

Vol. 30, No. 1 ·

STANISLAW SKOMPSKI & JANINA sOl3O~-PODGORsKA

acta geOlogic.

po,qn1ca

Warizawa 1980

Foraminifersandconodonts iri the Visean deposits of the Lublin Upland

ABSTRACT: ·Foraaninifer and conodont faunas recorded in_ the carbonate deposits foUnd in the boreholes Rudno Qnd Podedw6rzti situated on the Lublin Upland, are analysed for biolPbratigrapbic 'PUl'lPoses. Theforarriip.i1ers as :well as conodonts are indicative of the .uppermost Vlis&.n ,(V3c). The two borehole sections are

representative of disbin.ct conodont biQfacies.

INTRO:PUCTION

The borehole seclions IWdoo IG-l and Podedw6rze IG-2, northeastE".rn Lublin .Upland

(see

Fig. 1;

cf.

Cebulak.

& Po~cki

1976), show Mesozoic strata and the underlying Lower CarboniferouS deposits. The latter strata were subject. to various petrographic, palyru>logic; and niacropaleonto- logic investigations.- They yielded. macrofaunal - sssemblages indicative of

the Vise8n (MuSial 1976) and spore 8SIlemJblages

~cative·Qf

the Upper Visean (Jachowicz

&

Jachowicz 1976). The present authors recorded.

in

those strata abundant - foraminifers arid some . biostratigraphically

.im-

portant conodonts, which permits - a more precise -- biostratigraphic analysis of the Lower

Ca~boniferous

of the Lub.in Upland.

The foraminifer fauna was studied .in three hundred tb1n sections. The _ density of foraminJ1ers ranged betlween _I and 200speclmer;lB per thin. section. The preservation state w~s very goOd

as

^{a .rule.} TWenty saP.lPles· of 1-3 kg in weight

. were studied ~r oon04onlts. Three samples were barren, and the otheis: yielded

at most

so

oonodont specimens per kilogram

Of the'roclt.

GEOLOGICAL SECTIONS OF THE INVESTIGATEp BOREHOLES

. The Lower Carooniferol,lS deposits of Rudno-Podedw6rze . area accumulated

in

a marine nearshore

enVironment~~i'.ine

and nearshore to lacustrine sedimentary conditions were 'Changing Cyclically, which

is

. -

88

reflected'in lithology by the alternation of carbonate-clayey and sandy- -coal-bearing strata. Carbonate

beds

ranging' from a few up to a dozen or so meters in thickness are usually good correlation markers

(cf.

Cebulak

&

Porzycki 1966) but nevertheless, the two investigated borehole sections were correlated on this basis only equivocally and imprecisely.

Actually, the recognition

of

transgressive-«'egressive cycles in the sections and the distrft;>ution of the algae

CaZcifoZiuTn okense,

indicative of the uppermost Visean

(V3c),

have appeared more promising for the strati- graphic. correlation (SkornpS'ki 1980) .

. ' "

... .

....

:.>:-:.:-:-:.:-:-:.:-:-:-:~---I

... ^,

... .

---=---~-~

~.

'~4

,'1'11'11113

F·ig. 1. GecJIlogi.cial sket·CIh. nla!P of the NE part of the LU!bldn Upland (!Without Cainozoic, Mesozoic and Per.ql.ian formations; after Pozaryski & Radwanski 1972);

. inset shows loca.tion of the area in Poland

i

IInvESt.i:gated bo!'ebiOIl.es .are m.a.rked with bloack iIpo\&: Bd .Rudno IG-I, Pd 2 Poded.w6l'i:e .10-3 I Upper EocamsbriLan ('We!IIdI,sJn); J Oambclen, Ordovtlcian oaldd' SILlurian;. 3 lMIl&iJ.e· &Dd Upper

DeVlDl!llan; 4 Liowei" 8IIId Upper 'OarbOllll1ero\l8

In both the investigated

boreho~e

sections, the lowermost carbonate beds (depth interval

7~9.~791.0

m in Rudoo

IG-1;

depth ·interval · . 602.5'-;.606.0 m in Podedw6rze

IG-2;

see

Fig:

2) ' comprise very large

amounts of fragmented coral colonies;' bivalveB, brachiopods, and crlnoids.

These sediments accumulated probably in a high-energy reef core or forereef zone. All the overlying carbonate beds are criIioid-foraminiier biomicrites variablem. intensity .of . skeletal

fragm~ntation'

and contents of clay matter; commonly, these are mariy limestones to 0018.

FOitAMINIFER FAUNA

·Previous studies of the Lower CarbOniferoUs foraminiier faunas of Poland (cf. Jurkiewim & .Zakowa

1978)

were only partly concerned

with

the Lubl1n Upland (Liszka

i960, 1962;.

Ozonkowa

&

Soboii.-Podgorska

1972; WOS2Jczyii.s'ka 1972;

Soboii.-Podg6rska

1978, 1979).

. Three caa.-boriate complexes can be

d~inguished

in, the investigated . borehole sections after a variation in taxonomic composition of the foraminifer . assemblages,

and

mostly. the proporti?ns

of

particular foramiIrifer taxa.

The

lowermost complex (depth interval

791.0-789.0

m in Rudno, 606.0-602.5 ' m in Podedw6n:e; see Fig: 2) Shows '

th~.

poorest foraminifer assemblage including

15

species indicative of the Upper ViSean. The

far~unin.ifer

assemblage recorded

in

the overlying carbonate complexes

is

very abundant and diverse .. It includes Endothyra spirilli. ni- formis, . GZobivalvulina parva, NOVeUa 'sp., Rectocorntispira issatchkensis regiJ,ZariB, EndothyranelZa

gp.,

Loeblichia. ukrainica,

L.

ammonoides, Archaediscus cornuspiroides, NeOf!.rchaediBcusparvus, and Ja,."iiJc1ie~8ki­

nia ope.,culata associated with represent!ltiv€s of the genera Howchinia,.

Bradyina~

Valvulinella, PZanoarchaediscus, Tetrataxis,Endothyranopsl.s, Cribrostomum, and AsieroorchaediscUB (see Table n The assemblage is indicative of the foraminifer' zones

16i

and

16s

of Mamet

(1974)

and Novella & Neoarchaediscus incertus Zones of Paproth

(1969;

see Table

2),

that is of the uppermost Visean (V3c). There are no taxa typical of any zone lower

than

the

16

faraminiferzone of Mamet

(1974)

or of the ^zone

17

(lowermost Namurian). The recorded genera, species, and subspecies

;have also been reported

from

other regions

of

Pbland

^(~ee

Jurkiewicz

& ..

2;akowa

1978).

Western and Southern Europe (Coni! .

&

Lys

1964.

Coodl &

Dvofak

1969. Hcdlebt 1970, Ma~et 1973), Sovi~ . Union

. (Brazhni-

kova

&al. 1967,

Ajzenverg

& al. 1968,

Ydovenko

1979).

Amerioa and

Australia (Mamet 1968, Mamet &

Skipp

1970).

S. SKOiMlPs.KI .. ;r.' SOBOl'it -PODGOBSKA

Table 1

Upper V~smn foramindfers occurring in bareholes' Rudno and Podedw6rze

AHMlODIBCIDAE

Ammodtscul ootgenstB RaIWIer p.AlRA'I'HU'li.uo.m:NmAE

Diploaphall1i7ll1 i7ll18qUGlts (Dervd'lle), Df'affanta bUolJa cum~

Sacca~tnopats CGf'&ef't (Brady) PALAEOTIEX'I'UlLABIDAE

CUmacammt7ll1 ~.

Cribrostotnum eztmtum e:dmtfonntl UpIJn.a

C. bradyt MDeller C. f'eCUff8M vu.artooova C. .taltnogorllki up:n.a

Palaeote:rtuI4ria' brevtsept4t4 .Upi.na P. cOnlObrina UpIoa

P. gtbbo84 mtntma UpiDa , P. longtseptata crlUl84 'LdIILna

TETRATAXlDA!I!l

GlobtvllZwUna parva Tche~Dou8ova GlobtvalVUUna BP.

Tetrataztl angusta VlMm'IIonova T. deCUffeM Brady

T, mtnuta ~k~

T. paramtntma 'V1aNIIrlO111OVL

, T. preslUtw gigantea coon .. Lys ,

<!I'etrataxts ell: er. , ^{T. anguet4 v~lonova}

VCIlvuUneUa IJnQUtata Br.azlm1l11Ova

v. tchotchtat GrozdUova .. Lebedeva V. 1I0U~ (Brady)

CO'R.N'DSPIRIDAE

Rectocornuaptra ilsatchkenlts regularil Brl8oZlmlkov.a. BoztoYCeVa .. Koarpova TauR.NAYELLlDAE

l"orschtetla, grantUli B1'admII-lmva F. IUbangUlata (MDeJ:ier)

Lttuotubella glomospirotde,' ~

ENDOTHYBIDAE

BTlldvtna crlbroatomata iHBUSer '" 'ReitlUlger

B. f'otula (E1chwMd) CribrosplrlJ mtra BauBI!I.' C. pan,den MoeMer

,Endothyra obsoteta (.IiLIIWer)

E. omphllZot4 tnvolut4 ~a

E. omJ)halo&1J minima (BMIIIer .. Be1Wogea.')

E. priaCIJ (RauIer .. BeWoIIIIga:) 11:; pulchrlJ BrIII:hDI2cxJva '.. FIOteftll;aJa' E. pseUdobTadl/t Br:admI.kDva

E. stfnUts RaQler .. :ReL1itt1aer E. sp(rltttntfor17i4s (Brazhm.kiova

... potevllkaja) .

EndothvrlJnopsll camPl'eaa (Ra\llet'

• Rel.tl.In.) . E. conve:r:t.&B(RiaUBer)

B. crlUllUB aphlJericlJ ~ '" Re1tliDger) B. hiro,et Okdmura

E~doth1lf'aneIta rp.

GIoboendoth1lf'1J 8tegIJntuIIJ (Dul'kl.na)

G. 'globulul {E.lchwald)

G. tlchtmtCIJ ~)

J antschewrktma opercul4tlJ (Rauaer

• Rei.tl1DJer)

'LoebUchta IJmmonoides &ady

L. ukratntca (BrardJoild.kOlllil)

.1IItkhaUoUella Ill.

Novella BP.

ABCRAEDI8CIiDAE

· Archaedtlcus chll1"nOt.lBOt1te Milmet

A. COnV8%t.1B Gram.tlova .. Leb~a

A. cornuspt.rotdeB BrolllllUlll.lrova

• Vc1Oveolllo A. enor""'. ScIll}r.kOVa A. kIlrr8rt Brllldy

A. kreatovnUcovt koktiUbenstB R&User

A. moetzen Iligas R.a.U8ea.' A. postmoettert PotevfIlraja

AateroarchGecUlcus U: gr. A. blUlch1CWtcua

~ '" TeoodoroVII.tch N eoqf'chaedtlcus parvus (BaujIe:r)

'N. IUbbaachJc!rict.&s (ReLWoger)

· PlanolJTchaedtscus ez p:. P. gregorll l(DaI:n)

I.AS1IODll'SCIDAIm

· Howchtma eztItI oompT88Ba (Brazbndkova) H. gtbblJ 10ftQ1J (Br-ady)

OIZWAINAELLl!D.A.E

· J!!ofJtatlella r411Uat4 (Brady) l\ledtocrie medtocriB Va.adoauovill 111. bTevtsCUla GaneliDa

PBflIdoendothvr4 ornat4··Brady P. 8truVet (Moeller)

CONODONT FAUNA

The uppermost

Visean

oonodonts of Poland were subject to only

a

few

investigations. Actually, the only conodont fauna of that age: that

has

thus far been ' studied ' in· detail derived from Krzeszowice ares,

Cracow U:pland (Gromc.zakiewicz-l.omn.icka 1974): The Visean strata

foUI¥i in tEe

Gal~zice

syncline in the Holy Cross Mts are of virtually .

ACTA GEOLOG1CA POlJONlICA, VOL. 30 S. SKOMPSKI &. J. $OBO~-PODGORSKA, PLo 1

1 PllUleotextularUt ConSObTina Up'lna; boreb:ole RU<lllo (depth 759 m), X90 2 PlanoaTc/laedtscus eosptrtlUnotdes Brazh1likova; POdedw6rze (depth 560 m), X80 3 Loebltc/lta ammonotdes Brady; Jtudno (depth 738 m), X90

4 CUmacammina sp.; podedw6rze (depth 571 m), X40

5 RectocOTnusptra tssat.chkens!s Tegularis Brazhnikova, RlO$tovceva &. oKarpov; Podedw6rze (depth 586 m), XlOO

8 Bradlltna Totu/a ~Eichwald); lRudno (depth 7« m), X30

7 Endothllra om1'halota mtntma (Jtauser &. lReLtlinger); POdedw6rze (depth 586 m), XIOO 8 EndothllTa 1'ulchTa BMztmlkova &. potevSka,a: IPOdedw6IiZe (depth SS1 m), X100

• Jantschewsldnta operculata (Jtauser 8< ReLtllnier); POdedw6rze (depth 564 m), X40

ACTA GEOLOGICA POLONICA, VOL. 30 S. SKOMPSKI .& J. SOBO~-PODG6RSKA, pLo 2

1 - Archaedtscu8 convexus GrozcUl<>va & Lebedeva; borehole 1Podedwbrze (dewth 56J. rn).

X90

2-.'1 and 6 - Archaedtscus 7l'I()€ttert gtoas 'R&user; Rudno (depth 760 rn). X60 4-5 - Archaedtscus enormts Schykova; oRtudno (depth 760 m). X60

7 Archaedtsws SiP. and Valvultnetta young! (Brady); itudru> (depth 736 m), X75

a Eostalfelta radtata (Br.ady); IRUdoo (depth 744 rn), X9()

9 Archaedi$cus convexus Grozdil()v.a & iLebedev.a and Endothvranopsts sp.; Rudno (depth 738 rn), X40

CTA GEOLOGICA POLOmCA. VOL. 30 S. SlKOMPSKI & J. OBO -POOGORSKA. PLo 3

1 - BradlliT14 crilnostomato. .aa.user & Re1bl.:lnger; boreho)e Rudno (d~th 75~ m), X30 2 - Enctothllro. omphalcto. tnvoluto. Brazhnikov.a; Podoow6rze (dEllPtlh 593 m), X40 3 and 8 - Glcboendotl1l1ro. etego.nt>tUo. (Dunkina); Podedw6ra:e (d~pth 593 m), X30

4-5 - Endothllro. sptrmtnitormis (BNlzhnl.lrova & IPOtevskoaja); Podedw6r·ze (deptb 589 m), X6()

6 EndothllTo. pulchTo. Brazhn.!kov.a & Potevskaja; Podedw6r.ze (c!!lJ)th 5)3 m). X60 7 Cribrostomum extmtum po.ro.enmio. UpllUl; Podedw6rze (depth 537 m), X30

Endothllro. stmUts Rauser & ReLtlinger and EostalfeLLo. sp.; :Podedw6rze (depth 5eO Ill).

X5()

ACTA GEOIJOGiICA POlJOJI.'UCA, VOL. 30 S. SKOMPSKI & J. SOBON"-POOGORSKA, PLo 4

1 and 3 - HOUlclltnta gtbba longa (Brady); borehole Podedw6rze (depth 573 m), XlOO 2 - Valvultnella tchotchtat Gxozdllova & Lebedeva; Podedw6rze (dE\Pth 554 m), X 100 4-5 - Loebltchta ammonotdes Br.ady; podedw6I1Ze (depth 573 m), X75

6 pseudoendotllyra ornata Brady; ·Poded,w6rze (depth 561 m), X50 1 EndothYTa obsoleta Rauser; lPodedJW6rze (dept.h 586 m), X70

8 Jantschewskmta operculata (RaUSe.r & ReiUlnger); lPOdedw6rze (depth 569 m), X30 9 Endotl1YTanopsts crassus (,sTeady); 'POdedw6l'2e (depth 569 m), X 50

'w C)

~ VI

, '

I';""

,q

(\"I

>

f-

z

«

ju;

VI

-

_>

0::

I.LI Q.;

Q.;

::::>

VIS:mAN FORAMmIFERS ANi> cONoDONTS

0::'

~,' -VI ~w

~z

~2

Cii <0

...

<0 :!::.

VI ::::>

I- 0::

W U Z

-

VI ::::>

U VI Cl w et:,- :::I:

u

0:::

et:

0 I.LI

z,

-G et:

..J ' '..J I.LI

>

0

z

I-Z

8~ o,z

afa

u

I>=~

~~

VI ::;j ' 0 VI

Cl 0 , Z

VI VI ::::> ::::>

VI Cl

g

^:::I: 0 0 I-

z :Z

«

0 _C) Z et:

0

~ 0::

.et

Q.;

VI ::::>

Cl 0 :J:

I-

«

z

<!)

BOREHOLES

RUDNO , POOEDWORZE 2

c=J'1

_2 ~3 ,[:)}?)] _5

4'

BB

^fj

~7

'91

Fig. 2. Correlation of 'Visean borehole profiles Rudno and Podedw6:me 2i frequences ofconodonts are given at the right side of ea-ch profile

1 Vd868n ~ l-ooiat, 2 oIa,.a\lOlDe8, 3' mUCf8toll,eB, 4 8IlIIldSbDne8" Ii Coaa. ma.area, , car- ,', ~ BbSlea, 7 sctQmaTta-beiadIIS ~ earth

·92.

the same age

(cf.

Jurkiewicz

&

2akowa

1978).

The other· st;udies of the Visean conodonts of PolaD.d (Chorowska

1972, 1978;

Matyja

&

Narkiewioz

1979)

are not concerned with the uppermost part of the stage. Therefore, one has to compare the material derived from

Jh~investigated

borehole .sections of the Lublin. Upland to· the conodontzonation established ID

. other couiltries, namely Great Brdtain and Ireland,Belgiubl

and

northern France, West Qermany. The' uppermost Visean oonodont faunas show a considerable tUiifotrmity in biofaCies and hence, one

is

allowed to consider areas representative of t:Qe· basin and shelf·facies as well

(cf.

Austin

1974,

p. 11); .

The upper boundary of the

Vise~n

cannot .betraced precisely

in

Belgium and northern. France because there are no lOwermost Namurian strata in that area (Higgins

&

Bouckaerl

196.8)~

The 'classical section at . Tramaka, Belgium, includes the Visean to

Na:muri~n

transitional beds but nevertheless,· there

is

no possibility to trace· unequivocally the upper

Table 2

Upper Visean con,odonts occurring

iD.

boreholesRudno and Podedw6rze A,patognathus chaultodus VlUker • L. paTaciaTkt· iliaill'

A.. . geminu. (RIIlde) L. tra\'l.8Uons COlldineon 8. Druce A. mtnutulI AUatIIn & Huard Magntlaterella ~Tket· iRobode&, .AuiItLn

A. peUlus V!arker Br 1DirUc[E!

A. scalenus. Voa!r~MagntlatereUa lip • . •

ApatognathulI /Ip. MestognathUa btplut( If!Igglq

Cavusgnathus· nciviculu8 (H:l,nde) Mestognathu8 lIP.

C. unico7'nts YoungquiBt ,. iMiller Neopriantodus m"ntanaensts S·c.obt

Ca"usgnathue lip. N. p6TllCUtus (HI:Dde)

Gnathodus bUt.neatU8 bUVi8atf46 (Ba1JDdy) N. scUutus.·. Br.ansIlIl 8. Mehl G. gt7'tyi gl7'tyt HaIII . . NeoJl7'iontodus' lip •.

G. girnl coUt.nBonl lRboIdes, Auatln " Druce· i:>zoTlcodI.na lIP.

G. gt7'tyl melschneri AUBtdn

a.

^Husrd Pa7'aQnathodus commutatu. (DranlllO!D.

G. SJITIImutatus !lUlod1S,. AUSbID .. Dru.ce &.Mehl)

GnathodUs !!'P. P. ·mononoc:lo8Us (RbJoIde8, A'UaIlI!n &. Dt"uce) 1Ubba7'delZa (Boundtla) Bp. 'P. nodosUs (BlsciIDff) .

HlndeodeUa ibergenriS BischoU Pnon4odl.na· lae"tp08tlca (ReEoad ir COlIlmS'lIi) H. aubtl'Us Uktcl1. Br B a a ! I l e r . S p a t h o g n a t h o d u s cristu'Us YOIlIlgqw.t;

·HlndeodeUa sp. .

a.

JWller

Ugonodina 'ems Bnim.mn .. lMehi S. elUsom Merrill

Ltgonolitna !\p. S. mVlUtU8 ~

LonchOdtna ;tunrillht Rexroad S. scttu'", (Hlnde)

})LATE 5

1 - Gnathodus 81/mmutatus BIbJOderl, AU8tIn Br. Dlruce; _ a ^oral vdew, b l.ateraIJ. view: borehole

itUdno (depth '744 m). XilI30 .

2 - Gnathodus gtrlY~·gfrlyt ~: OIl'.aIJ. vd_i. iPodi!dlw6r1!:e (depth 11'11 m), X45

S - GnathoduB gt7'tyl gl.rtlli BaaI; I.nner Jatei:!al -9dew: 1POded.w6rze (depth

zm.

^m). X45 4 - Gnathodus bUineatus ·btlViBatUs (ROIUIndy); iDI."81. wew; Podedw6rze (depth 571 m), X50 5 - Paragnathodus commutatus (Br.&lDllOll Br .Mebl): IOl1li 'view: RUIdalIO (dep.th 744 m). X90 8 - Pa7'agnathoo.us nodosus ~); 0!t1IIil vdew: audno (depth 7Mm), X90

'1 - Gnathodus gl.rtut colUnsom 'NIIodar, .A.u8t.tn Br· Druoe: Rudno (depth 'l~.2 m), XOO 8 - Gnathodus gf.7'tyi gl.rtyf. !HaaI: oral VIIew: Rudno· (depth '138 m), X8

. t-lIt and 18 - . ea"usgnathu8 wdcor!'14s Youongquist; Br MlIller; lIImer lIIterail v1ew; R~dIIlO·

(d~ 'l3B m), X40 '

11 . ...:. Mestognathus .btptuti. HDggtna: 1m1er ~erai view; R'Ildno (depth '1159 m), XIS 13-1& - Mefiognathus .biPlutt ~: or.a.l. news; ~ (tie:pbb.. 'l~9 m), X35

AeTA C#EOLOOICA POLON'lCA. VOL. 30 S. S'KOMPSKI 8. J. SOBON-PODGORSKA. pt... 5

93

boundary of the' Visean in spite of the abundant conodont fauna (Austin

. &

al.

1974)~

ln West . Germany, the orthostriltigraphic, goniatite-based . Dinanti.8n1Silesian boundary occurs (Meischner 1970) within a· long-

-ranging cOnOOont zone, the Paragnathodusnodo8tts Zone. Hence, the only · way to trace precisely the upper boundary of· the Visean with application

of

conodonts

is to

base' upon the stratigraphic pattern ,

established in Great Britain by Rhodes

&

al. (1969) andHiggins (1975).

Accordingly to

Higgins

(1975), the uppermost Visean conodont zone

is

the Onathodus girtyi collinsoni Zone of Rhodes &al. (1969). The zone was initially meant as equivalent to the uppermost

part

of the Lower through the Upper Bollandian

(Pld

to

P2a-c in

the goniatite zonation).

Later' on, Austin (1973, 1974) hasrestdcted · its Btiatigraphic range to the Upper BoHandian only

.(P2b-c):

The upper boundary of the G-nathodus girtyi collinsoni Zone (sensU' Higgins 1975), coincident with the upper boundary of ' the VlSean Stage,

is

marked by ' the

first

appearance of Gnathodus . girtyi simplex Dunn. The Gnathodus girtyi collinsoni Zone and tbe underlying Gnathodus mononodosusZone may be jointly equivalent (see Fig. 3) to the widely meant Pamgnathodus nodosus Zone

of

West Germany (MeiSchner 1970).

r.ONODOlfrs COIIOOOIITS

.a .. !.

Federal Republic Great Britain .:~.

of C ... ...my (Rhodes. Austin &:

!:··i

^Z Great Br1ta1D (Meiochner 197DI Dr".'"- 1969) ~ '.2 (Higg1no 1975)

E2 ^{. Gn..} bil.1.neatLls bollanife.Dsis

III . Kladc>gnat:hlUl - GD. glrt:yl "bop.l .. "

Cl>. glrtyl C

colJ1nsoni. _P 2

Gn. glrt9j

par~gnathodUB coll1n.anj

nodosu. I

O'n _ mononodosu.sr ^PlC- PZA

_tognat:hus P1A, B (;n. b1l1naat:as backzlann.1 -

bilineatu. _Gn. b111neatus

V3b 15

____ 2 ____

B

--'9--

Fig. 3. Scheme 'of corl"elatioDs of the Uppermost Visean· .divisioDS based on fomminifers and eonodonts

The conodont fauna recorded .in the investigated borehole sections ' (see Table 2) includes' the following species ·indicative of the Para- gnathodu.s nodosus Zone: Gnathodu$ Yirtyi girtyi Bass, On.

biZtneat'Us

bilineatu$ (Roundy). Paragnathodus nodo{U3 (Bischoff), Mestognathu$

bipluti Higgins, and N eopTioniodu8 scitulus Branson

&

Mehl.. These

forms are associated with index species

of '

the zonation proposed by Rhodes & al. (1969), namely: Gnathodu8 mon.onooo8u8 Rhodes, Austin

&

Druce and Gn. girtyi collinsoni Rhodes, Austin

&

Druce. The latter' species occurs exclusively in the uppermost sample of the section Rudno (depth of 7;12.0 m). Possibly, ,this is the only · portion of the ' section being of the latest .Visean age. ,The subspecies G-n. girtyi collinsoni has

I).QI;

been

recqrded in

the $Edion Podedworze. One may' thus concIllde that the inv6\Jtigated strata are representative of .the uppermost ViBean exclusive of its uppermoSt

paI't.

The conodont

f~una

of Rudno -includes representa- tives of the genera Cavusgnathus and Mestognathus absent from the Podedw6rze ' fauna.

'J:'his differen(!1;! in conodont fauna composition ,may indicate that the sedimentary. environment of the carbonates found in the borehole section Podedw6rze was more open marine in nature ., than that prevalent

in,

Rudno. area,

(cf.

Druce 1973, 'Austin 1976, Merrill

&

Martin 1976).

Institute

of

Geology a/the Warsaw University,

. Al. Zwir.ki i, Wigury 93, Q2-089 Warsz4wa, Poland

(S. Skoci:lpeki)

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VOl.

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OTWORNICE I KONODONTY' GORNEGO WIZENU POLNOCNO-WSCHODNIFJ L~LSZCzYZNY

(Streszczenie)

Przedmiotem pracy jest anaIiza fauny otwomicowej d kotllOdontowej, kt6ra vi wier.ceniach Rudno i Podedw6me w polnocno-wS<lhOdniej LubeISzczyinle. (fig. 1) dcfkumentuje obecnoSl: n-adwyZ~ lWii.enu (V3c)~ Dokladno~l: rz: jalkll lIIlama do- korial: klasyfilkacjd stTatygmficz.nej IW pm;ypadku obu faun jest podobna. mimo macznie cz~stszego wyst~owania ^{otwormc ndZ} ·konodont6w '(por. fig. 2). Wyst~po­

wanie 'w zr6.Znd.oowa:nym. ozespole obwomicoWym form IZ :rodzadu Asteroarch~e­

discus, Neoarchaediscus, Novella, Globivahiulina i Rectocornuspira (patrz tab. 1 ora!!. pt 1--4), ,paDwala Iba~ odcin.k:i profilu zaliczyl: do I2lQny otwomicowcj Novena .& Neoarchaediscus incertUs w podziale Paproth (1969), odpowiadajllce"

zonorn 16i ora'Z 16s w podZliale Mameta (~974). Znalezion~ konodo:nty (patrz tab. 2 oraz pt 5) reprezenil:ujll analogiczD.y. p:rzedzial czasowy (por. fig. 3), tm. zonlt Pa1'agnathOdus nodusus 'W ~iQle Meischnera (1970). ZeSpoly otwomioowe zna- lezione ';w ibadmycl).. profilach me WYika.7iUj1l 2Il'6Znioowanda regionalnego, nalimilW!t konodonty repr~-ujll zes-pOiy przynalezne do dw6ch typ6w facji: przybTZeZno- -Ill<lrsklej (Ruidru» oraz basenowej (PodedwOrze).