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Någrn iakttagelser rörandeundre och mellerstadicellograptusskiffern i västraSkåneRagnar NilssonPublished online: 06 Jan 2010.

To cite this article: Ragnar Nilsson (1953) Någrn iakttagelser rörande undre ochmellersta dicellograptusskiffern i västra Skåne, Geologiska Föreningen i StockholmFörhandlingar, 75:1, 43-48, DOI: 10.1080/11035895309454852

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h':\ g r n in k t t 11 g e 1 s e I- r 6 rand e 11 II tl re o c I I 11 1 c I 1 c r s t a tliccllo,~mptasskiff'cl.n i viistrn SkAiie

A v

ILWNAI~ E'ILSSOS

,Ibsfrpcf. Titlc: Some obscrvnt ions conccrniiig thc Imvcr nntl JIiddlc Diccllograptus shalt in n-cstcrn scnnia.

Uouldcra of Ordivicinn black, hard e l iah . partly rich in grnptolitcs, 1iavc bccn found nt Sularu (about G kni E of Luiidl in thc FdEcls.tnC district in the provincc of Scnnin. h h c - . . ont~logically thc graptolitc n&mblagc i; not&lo SO fnr ns griptolitcs, having hithcrto been considcrctl to bc rcstrictcd to the Loivcr Diccllograptris rlialc (cspccially thc znnc of lvttiingrapfit.9 gracilij) occiir togctlicr with graptolitrs, which bclong to thc JIiddlc l)iccllo- graptu9 slialc, in tlic gcnrral opinion, Thus Xttnngrnplua cf rrnci1i.t (J. 1IAx.r.) and Di- c t l lqmjdus diraricnfus (J. HALL) h a w bcrii found on tlic sanie bcd surfiicc ns Orfhograpfus calcaralus L.\r\\-ORTiI and Orlhoqrapltts cnlcarulus 1-ar. bnsilicus hrwonrrr, nnd it is suggcstcd that tlic graptolitc asscmblagc forms e transition bctwccn thc graptclitc fauna of tlio L o w r and tlic Jliddle Diccllograptus shnlcr. l 'hc occurrcncc nt Sularp nlso sccnis t o indic3tc tlint iVrtiiagrapfits gracilis lirs a widcr rnngc in the Fdgclshg district than it has Iiithcrto bccn srippnscd. It may bo mcntiuncd that, according to OrrK (Taorossos 19-28. p. 159). 3 graptclitc. very likcly constitutiiig 3 rpccimcn of iYttiiagrapltts gracilis, lins bccrr found in the Ordovician scqucncc If' of Estlionie end in thc opinion of Troed3ion indicates a grcntcr rnngc of this spccic!, tlinn hitherto known. In Canndr they liavc mct with S t i t i n - graptirs grncilis in laj-crs (I~pwortl i 's *zone without Cocrigraptur grucilisc) nest nbovc thc zono of Stttiagrapfiis grncilis (RUEDENASS 193. p. 2s)). In 1915 I I m D r . v a statcd that tho Jliddlu ~Xcc~lopapt i i s shale cordd bc divided into the

following four zones (in dcsccnding ordcr); Xonc of Cliiiiacqraptus dyloitlrus LAPIS-.

D o Dicrangrnpfus clingnni Cmn. * -4tiipltrgrnpfiii c'asac (TuLLIi). D Cliiiiacograpfits rugosus TCLLD. (= Diplgropfir i molesfur Tiionsrcsn).

I n tlic Ydgclshg district, ns far as i t is known, tlic zonea of Cliiiincqraplur slyloidtici nnd Atiipfrrgraplus rusnc arc lacking and. nccording to JIonrna (169G, p. 15), tkc zone of Diplograpfits ttioltstits is hithcrto considcrcd to bc cquirnlcnt to the zonc of Dicmnograp- fu3 clingani in eouthcastcrn Scnnia, though charnctcrizctl of Diplograplus tnolrsltrs instcad of Dicrangraplits clitignni. Our knoalcdgc of the scquencc of tlic Jliddlo Diccllograptus shslc in tlio FAgclsitng district is impcrfcct, but i t can be said tha t the ndoptcd division docs not corrc3poiid to tho rcal conditions ns tlic rnngc of the graptolitcs indicntcs. Tliui Diplograplus aiolcslrcs is one of tlic predominant graptolitcs of tho zonc of Xeinugrapltrs gracilis in tlic Fdgclslng district (IIEDE 1951, p. ti7) and conscquently i t is not suitablc. ns nn indcr fossil. for a zonc of its 01\11. Further, observations, hitlicrto madc, show tha t thc 1eycr3, following nest abovo tlic zonc of n'rniugraplitt grnci1i.i in thc Pbgclshg district. could not bc idcntical with thc zono of Dicrungruplus cfingani in soutlicastcrn Scania but i t is to be supposcd that tlic scqncnco in the P3gclsing district which Iiaa up till now bccn put togetlicr as a zoric of Dicrrrnqruplrts clingntti could bc diridcd into scrcrnl ZOIICS.

I skiffcr, lijsbriitcn r i d spriirigiiiiig av nvloppsriinlin f r h Sulnrps kvarii, Hnrdebcrgn sockcii, pitriiffnclcs soiiiiiinrcii 1944 c ~ i graptolit- fauna, vilkeii ur flcra synpunktcr torde kuiilin +Skiin ct t inern nllliiiint intressc. Skiffcrn' jiiiiitc dinbns iir cnligt. uppgift a\- kvarniignreli an-

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41 RACSAR SILSS0.Y I Jnn.-Fcbr. 1053

stiendc i nvloppsriinnnns botten, beliigcii ungcfiir 1 in under ninrkytan. Tyviirr iir den nunicrn ickc tillgiinglig i fast klyft, och for fs forsok n t t upptagn en ny profil liar oniojliggjorts av den saiikn terringeii, varfor en uttoinmande beskrivning nv lngcrfoljdeii icke kan liimnns. Uetriif- fnndc onigivniiigeiis gcologi sknll hiir ciidnst oiiiniininns, nt t orthisskiffcr nnstdr n i r n jordytnii i Siilarpsdnlens norrn sluttniiig p i ijnise siclor o m iiedfnrtsviigeri till kvnnien sniiit iir jiiiiitc skiffcr ~ n e d Diplogrnptus molcstus tillgiinglig pii c t t flcrtal stiillcii iitincd Sularpsbtickcns lopp, oster 0111 Suliirps kvnrn (OLIS 1906, S. 13-15, ~ I O I ~ E R C ; 1910, S. G8-71).

Pig. 1. liartskiss ijvcr Sularpstrakten. Pjndortcns Iigc nngivcfi a\- pilcn. Eftcr ckonomiskn knrtblnclct Hartlcbrrga.

Fur publicering godkiind i rikcts allm5nn;r knrtvcrk tlcn 23 januari 10.53.

Dc friin riinnnn Iiiirrornndc blockcii utgorns, forutoiii nv dinbas, ovcrviignndc nv cn tjockkliivcii, hdrtl, svnrt - i kontnkt incd dinbns vitgrii - lerskiffer, stuiidom knlkhaltig ocli st Alvis iiiipregnernd mccl svnvelkis. Enstnkn block av en svart, linrd knlksten hn iivcii antriiffnts. Fossilen, vilkn i vissa skikt iiro ynmign och oftn vnckcrt bcvnrndc i svnvcIkis,’utgoras till stijrstn delcii av gmptoliter. Utoiii dc i ncdniistden- de tnbell nnfordn graptoliteriin ha foljnndc nrter kunnnt bcstzninias: T’lrniiiirogrcrplus sp., Olrolus cclsus HADDISC, I,eptolroIits? kincri (HAD- 1)1 S G ) , ? I’(itcr i l l ( & loh ctt I ic(b I ~ A i i n ~ s I)E , A crol rct o chi bit6 HA 1) L)I SG , Did- itrtirielltc trrgeiiten (IIxsrscen), Soirerbyelln sp., koiiodont, Ortlrocertrs sp., CaltJitrctie cf tlilntatn TULLDERC, Ostrcicotln. DC allmiinnnst forekommnndc grnptolitcrna iiro Diccllogrnpfits

tlircrricntus, Clitirncogrccptits niitiqziiis, Diplograptiis tirolcstus oclr Ortlro- grtrptiis cci lcnmhs, av vilkn Diccllograplus tlictiriccitus, Clitiincogrnptus criitiqitus ocli Ortlrogrcpliis ccilcctrdus vnr for sig stunclom upptriida innssvis och tiickn licln skiktytor, c t t forckonistsiitt, soni ciiligt I’n~scr.~ (1948, s. 23) otvivclnktigt niigcr ofta forekomniande nvbrott i scdi- Inentat ionen.

1 ’Tillforlitlig uppgift om miktighctcn hnr ickc kunnnt crlibllnr.

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~ a b ~ l l anpivniidc dc vid Sularys kvnrii antriffndc graptolitcrnn jiinitc dcras hi t t ills kiindn rertiknln utbrrtlning inom Sklnc-Boruholnr ocli Storliritaw nicn fr. 0. ni. Z. m. rYoiingrnpiits grncilis t. 0. m. z. m. Dirranogrccpfas clingani (Iii~vudsakligcn tiiligt tlppgirtrr 1103 Tulllcrg (1S1). Ellcs t \\'ood (1931

-1916), Tiirnquirt (1913) ocli IIndtling (1915).

Lcpfgrnpfirs /laccidits (J. IS ALL). ................ ~ ~ t ~ ~ o g r n p f r t s gracilis (J. HALL). ................. 1)irtllogrnplics dirnricafus (J. IIALL) ............. (,'littcncgrnpius nnliqiiiis I,.irlvOzms ..............

* tirorrris (J. I h L L ) ............... b rrharertlrrgi ~ ~ 4 1 * I ~ O f ~ T I ~ ...........

Orfdgrnplirs cnlrnrafir3 L.\P\VORTiI' .............. D b cnr. ba3ilicri.r L.\rlvonm . . D fririicnfirs L pniiprufi is E. 6 \V. ..

Diplcgrapftrs t ~ ~ o l e s l a s ~ I I O H S L U S D ............... Vcsqraptic-9 tmultidrns E. C \\'. ................. X a n q r a p l r i s sp. ............................... I ln l lgrapfus tnncronnfus (J. IIALI.) .............. ThysnrigrapIus hnrkntsai (SICISOLYOS) ........... ? D D rnr. roefnfics L.\iwotmt . Corynoidrs ciirfirg L.wc-onTir ....................

* cf caliciiloris XiIcttoLsns .............

s cf. gracilis (J. I h L r . ) ..............

? r ~ l l l ~ d ~ X O g r ~ p f U ~ 1flCCT I I A D D l S C .................

SkAnc.Ilorn- holni.

+ + + + +

+ + + + -

-t

+ + + + +

+

y

Storbritannicn.

Soiii nv tabelleii frnmgbr niitriiffris Diccllogrtrptus divaricntus, . " ~ ~ t i -

grnptiis gr(ici1is och iYniiogmptiis sp. ickc hogrc upp nil i z. in. KcrIragrnp- tits gracilis, (1. v. s. ovcrstn zoiieti nv uiidrc tliccllogrnptusskifferii, under dct n t t Leplogmptiis /lnccirlus, Orlliogroptiis cnlcarnfirs, Ortlto- p p t i i s calctrmtus vnr. l(i.silicus, A1iiplczogmptu.s lncer, Coryloides curtris och Coryioides cf caliculnris hclt tillhora iiicllcrst n diccllograptusskiffcrii. Ornptolitfnuiiniis i Sulnrp saiiiiiiaiisHttiiitibl Hr miirklig sbtillvidn, a t t nrtcr, vilkn hittills aiisctts begriiiisadc till uiidre dicellogmptusskiffcrii ocli siirskilt z. 111. Mcnagmphis grncilis, diir triiffns tillsnniiiiniis iiied nrter, soiii cidigt giiiigsc uppfnttiiiiig tillhora iimllcrsta diccllograptus- skiffern. Vnd dciiiia nrtblnndiiiiig bctriiffar, liggcr iiiisstaiikcii iiiira till hniids, ntt c l i fossilcii ickc iiisniidnts i fast klyft, dcsnnunn i sjiilva vcrkct.

1 Itlinldoaorncts ldngri 4-3 m m (+), brcdd 2.5-3.2 mm. Sicula cj iakttngcn. Vir- gcllan, som iir omgivcn ar c n mcmbran, liar cn 19ngtl a\- G rnm (+). Antnl tckor 10 p i 10 mni. Usstltekornns tagg 1 4 mrn (+). >Icdianscptum listforrnigt. rakt, markerat, brlii- gct i rhnbdo5omcts mitt. Virgulans 19ngd 3.2 mm (+). Do prosimnla tckornns ventralrand konvcs, d c distalar mcrn rak. i b5da failrn mcd cn insniirning ncdanfor npcrturnlrandcti. k t c n nvvikcr frSn dcn RY Elles C \Vood bcskrivna cngclika formcn ifregn om basnltng- gnrnas lingd, som hos forcliggnndo cicmplrr iir kortarc.

Yar. bnrilicirs 6vcrcnsstYmmcr v i l nicd IIADDTSCS bcskrivniiig (1916, s. 14).

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4ti I t A O S A R XILSSUN [Jnii.--Ycl,r. 1953

hiirrora frdii skikt , tillliiiraiidc ski1d:r zoiicr. Ehiirii mojlighetcn diirnv ickc knii uteslutns, tordc tle ncdnii iiieddclnclc cscmplcli pR graptolit- nssocintioncr i c t t aiital stuffer, i vilkn fossileii triiffns :i semina skikt- ytn, undnnrojn vnrjc tvivcl pS deii liiir foreliggnndc saiiitidign fiirc- konistcii, nhiligcii dels nv nrtcr, soxii vanligen hiinforas till tlcii iiiidro tlicellob.rnptusskiffcrii, dels nv sddnnn, soiii knrakteriscrn iiiellerstn dicellogrnptusski ffer~i.

Stuff iir 2. Neiirngricptus sp., Dicellograplvs dirnriccilus, Cliiiracogrnptus crirtigviis, Orlhogrnptris ccilcartrl its, Tlicriirriograplus sp.

Stuff nr 6 &. 7. Neiiingraplus c f gracilis, Cliitrncograpttts cotliptius, Ortlioyrccplus cnlcnrctlus, Diplogrnplris iirolestzts, Lasiogrciptus sp., Coryio- ides curlits.

Stuff nr G. Diccllograpfus rlicirricaltis, Cliiirncogrccytus tcirtiqriits, Orllro- grnptus calcarnlris, Diplograptus iirolestrts.

Stuff nr 8. Neiiictgrcrptus cf gracilis, Dicellograplus tlicnriciilus, Ortlio- grcrpl its ca lcn rn its vnr. h i 1 icris.

JIed hiinsyn till den ovnii beskririin sanitidigit forckoinsteii nv pap- toliter, tillliorniide undrc resp. iiiellcrstn dicellogr:i~)tnsskifferii, och till npptriiclandet nr stuiidoin hcln skiktytor tiickniide sviiriiinr nv Ortlro- grnplrrs calcarcrtus forcfnller faiinnii iiiirninst born beteckiias snsoni eii

overgbngsfnunn iiiellnii grnptolitfnrinoriia i iiiirnndn skiffrar. Enligt ELLES (1937) iiitriiffnr dct storn mtbrottcto av orthograptider niii thc transition bcdso (z. in. Cliiirncoyraptus pellifer och dfesogrnptus itiiil-

ticleiis) och ii ir siii hojdpunkt i Lon-er Hartfell. 8vcrgHiigslccl niellaii undre och nicllcrsta dicellograptusskiffcrii iiro kiiiidn frdn Riistingn och Figclshng (I iADDISC 1913, s. l G , 22), iiicii iiAgoii direkt motsvarighct till Sulnrpsfnuiiaii iir, siivitt forf. hnr sig bcknnt, icke kiiiitl friii dessn loknler. Av ititressc iir, n t t A skiktytor tiickta nv grnptoliter hclt till- hornnde iiiellcrstn dicellogrnptusskiffcrii, Dicrattograplus cliiigcciti icko i r forctriidd, cii omstiindighct, soin niojligcii anger, n t t vid Sulnrp - i likhet med vad fallct iir i Figels6iig och Riistdnga (HADDISC 1913, 6. 81) - iidgoii zoii iiied Dicrnirograptus cliirgniii ickc finncs utbiltlnd iiiirninst ovnn zoneii nicd Netiingraptus grtrcilis.

XOIIESC (1S9G, s. 15) uppfnttnde lngrcii ovnii z. 111. A'emyrnplzis grcrcilis i vastra Skilie soni ekvivalenta mecl bildiiingnr tillliiirn~idc z. ni. Dicm,iogrnplus clitrgaiii i sydijstrn Skhne, elioru knrnkteriseraclc nv Cliiiiacogrciptus riigosris TWLLU. ( = Diplograptus niolcslits TIIORSLWXD) i stiillct for Dicranogrcrpfits cliiigmi, och bcniiiniidc cleiii (19Oi, 8. 80, 1910, s. 10) ozon nied Uicrcrnograptiis cliiigiriri CARIC. cller Cliitictcogrnptus rugosus TWLLII.)) Efter O~rss (190G, s. 79) fyiid nv Dictaiiograpfus cliiigaiii tillsamninns med Cliiiiacogrcrplits rugosus niisdg T ~ ~ R ~ Q U I S T (1913, s. 42I) , a t t zoiieii med Cliiiiacograplits sugosits iiiist sitt bcriitti-

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gnlldc som sj5lvstiindig zoii ocli betrnktnde den som idciitisk iiied zoiicn lllcd Dicmiiogrnpfics clitigtoii. !hOEl)SSOX (1923, s. 2.13) ocli TIIORSLUSXI (19.10, s. 121, 183, 1918, s. 359) upptnga clock zone11 soni sjiilvstlndig zoll, skild f r i n z. 111. Dicrtrtiogrcipfus c l i i i p t i i nv z. 111. Airiplezogmphs rfIs(le. Sorii frnmgiir nv HEDES (1951, s. 67) iindcrsokningar i F.igelsing ;r Diplograptus iuolesfits vnnlig i hela zoiicii mcd iYctiiaymptrts gracilis ocll utgor siinrnre e t t nv knriiktiirsfossilen i dcnna fn lcdfossil fiir en egen z ~ l l , tillhiirnnde iiiellcrsta dicellogrnptusskifferii.

De cseinplnr nv Ncitircgraplits grucilis (J. HALL), soni piitriiffnts vid Sulnrps kvnrn, overensstiiiiinin i allt viiscntligt mcd den n\- ELLES k \\’OOD (1901-1918, s. 13i-129) liininade knraktcristikeii a v arten ifriign, varfiir cii ny bcskriviiiiig syncs iiverflodig. Yati bctriiffnr deli

\-crtiknla utbrcdliingen nv Neitingrctptirs gracil is , betrnktnr Lapworth &nnn a r t siisoni typisk for zoiien med Notiayrapfirs grncilis i C:inndn, ocli eiiligt ELLES D \\'eon (1901-1918, s. 129) iir nrtcii jiimte varictctcr i Storbritaiiiiieii inskriinkt till ifrignvarandc zoii. Eliligt ItUEDEJIASX (1908, s. 280) hnr -4m i Cniiada iiveii triiffnt den i ni?riiinst yngre zon, Lnpvorths ))zone without Cociiograpfirs grnciliso, och enligt op ik hnr en graptolit, snnnolikt tillhiirandc clcniin ar t , fiinnits i D’ i Estlnnd (TI~OEDSSOS 1928, s. l’i9).I I ovcrciisstliiiinclsc ~iied Troedssons i ~pp- fnttning (1. c.) syiies (let si lunda finiias nnlcdning formodn, nt t ifrdga- vnrnndc nrt liar storre vertikal utbrcdning fin soin hittills nnsetts vnra fallet, och deiinn formodon forefnllcr enligt forf:s fiirnieiiniidc iiveii bcstyrkas av forckomstcn vid Siilnrp.

Trots viir bristfiillign kiinncdom 0111 iiiellcrsta dicellograptusskifferlis lagerfoljd i Sulnrp-FngclsHngoiiirddet , knn tiet rednn nu siigns, a t t dcn vcdcrtagnn inclclniiigcii a v densnmmn icke liclt niotsvarar do fnktiska forhdllaiideiin nt t doiiin nv graptolitcriins vcrtikaln forekonist. Soin ovan niinints, utgor Diplograptus itioleslus CII a v de i z. ni. Nettingraptus graciiis forhiirsknndc graptolitnrternn och knii av dcnnn nnleduing ickc iiliscs liiniplig S O I ~ ~ lcclfossil for C I ~ cgcli ZOIL l)c hittills gjordn iakttn- gelserna givn tlcssutoiii vid hniiden, n t t lngren iiiirinnst oran z . in.

A’otiagraptits gracilis vicl Siilnrp ej licllcr kiinna niiscs identiska mccl z. ni. Dicrrcmgrcrp~irs cliiigntii i syostrn Skdne, utnii (let forefnllcr snniio- likt, n t t iiinii iiioiii deli lngcrfoljd i Sulnrp-Bigelsdugoiruii~lct, soiii tidignre snmninnfnttats undcr bciilmningcn z. 111. Dicrcmograptirs clitrga- )ti, sknll kiilriin utskiljn flcrn zoner, en uppfnttning, som tydligen iivcii

Ned liaiisyn till Sulnrp-PngclsHngsf~iltcts stiillning soiii e t t av d o fiireS\’zVilt ITADDIS(: (1915, S. 370-371, IIOt).

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4s lL4CSAR XILSSOS [.J:iii.--Fch. 1052

klnssiska oiiiriden:i for svcnsk stratigrafisk forskning, frmiistfir cii rcvi- sion av bl. n. inellcrsta diccllogrnptusskifferris lagerfoljd och fnunn soin c t t ijiiskciiiil nv forstn orclningcn och skullc - ~ i i e d hjiilp av c t t niitnl korta kiiniborriiiiigar - bidraga till a t t sknpn full klarliet betriiffande cn Ingcrfoljil, soiii iir grundliiggondc for vbr uppfnttning 0111 iiiellerstn ordoviciuin i graptolitfncics.

1~itternturfiirtccl;nIii~

ELLES, C. L., 1937. The classification of tho Ordovician rock. - Tlic Ccol. Nag. Vol. 54. London.

ELLES, C. L. b: \Voon. €1. 11. It., 1901-1018. A monograph of nritislr grnptolitcs. Parts I--\’II. l’nlncontogr. SOC. London.

I h D D I S O , ’1.. 1013. Undrc diccllograptusrkiffcrn i Skdnc jiiintc nigra diirmcd ckx-ivnlcnta bildningar. - Lunds Univ. Arsskr. S. Y. 2. ~d 0. SO 15. Lund.

- 1015. Undro och mcllcrsta diccllograptusskiffcrn i Skinc ocli A Ilornliolni. Jlcdd. fr. I h n r k Ccol. For. J%d 4. Kobcnliam.

I I X D ~ , J. €1.. 1951. Boring tliroufih JIiddlc Ordovician-Upper CanrLriaii strntn in tlic Fd- gclsinz district, Scnnia, (Stvcdcn). 1. Succcssion cncountcrrd in tlic boriiig. - Luiitls Univ. drsskr. S. F. A d . 2. Dd 4G. S o 7. I.und.

JIouciio, J. C., 1606. Ccologik rigvisaro inom Fogclsingstraktcn. - Jlctltl. L i i i r d i Ccol. Ydtklubb. Xo 2. h n d .

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Oms, E., 1036. Om do chasmopzkalkcn oclr trinuclcusskiffcrrr motsrarandc bildningariic i Skbnc. - Lunds. Unic. Arsslir. X. F. Afd. 2. Dd 2. S o 3. I.unt1.

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