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Of the Carnian Stage

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Of the Carnian Stage Rivista Italiana di Paleontologia e Stratigrafia volume I u) numero 1 tavole 1-10 pagne 37-78 Aprrle 1999 THE PRATI DI STUORES/STUORES \TIESEN SECTION (DOLOMITES, ITALY): A CANDIDATE GLOBAL STRATOTYPE SECTION AND POINT FOR THE BASE OF THE CARNIAN STAGE CARME,LA BROGLIO LORIGAI, SIMONETTA CIRILLI2, VITTORIO DE ZANCHE], DONATO DI BARI4, P]ERO GIANOLLA], G]AN FRANCO LAGH14, \íILLIAM LowRIEs, STEFANo MANFRIN]. ADELAIDE MASTANDREA4, PAOLO MIETTOs, GIOVANNI MUTTbNI5, CLAUDIO NERI1, RENATO POSENATO', MARIACARMELA RECHICHI4, ROBE,MO RETTORI2 & GUIDO ROGHI3 Receioed August 20, 1998; accepted February 23, 1999 Key-*^ords: Carnian, Biostratigraphy, Ammonoids, Conodonts, rari brachiopodi sono limitati aila pane medio superiore della sezio- Palynomorphs, Foraminifers, Gastropods, Bivalves, Brachiopods, Mi- ne (Kaninckina leonbardi, Retzia sp.), dove pure si rrovano nove spe- crocrinoids, Holothurians, Magnetostratigraphn Sequence stnti cie di gasteropodi. Un picco di diversità tassonomica molto netto ri- graphy, Dolomites, Southern Alps. guarda i foraminiferi bentonici isolati e le scleriti di oloturie ed è palese nella parte superiore delia Subzona a Duatina cf. canadensis. Riassunto. \il/iesen La sezione di Prati di Stuores/Stuores (For- In panicolare, vi compaiono scleriti finora segnalate nella Subzona ad mazione di San Cassiano), affiorante nei dintorni di Pralongià, a S$l Aon. le variazioni in frequenza e drversità tassonomica di queste fau- di San Cassiano/St. Kassian, sul versante meridionale del crinale che ne mìnori suggeriscono condizioni anaerobiche-disaerobiche del fon- separa la Val Badia/Abtei dalln Val (BL), @Z) Cordevole è nota come dale nella pane rnedio-inferiore della sezione (O-105 m), quindi una sezione tìpo del Cordevolico. In tempi recenti sono stati individuati tendenza ad ossigenazione più stabile nella pane superiore. La ma- al di sotto della tradizionale Zona ad Aon, numerosi livelli am- con gnetostratigràfia mostra quattro intervalli a polarità normale e rre a monoidi della Subzona a Regoledanus (Zona aProrrachyceras), seguiti polarità inversa. La base della Subzona a Daxatina cf. canadensis è da altri dove compaiono in panicolare i generi Daxatina (Daxatina prossima alf intervallo di polarità noimale S2n. Dal confronto con i sp., D. cf. canadensi), Clionitites e Trac/ryceras, quest'ultimo rappre- dati paleomagnetici della coeva sequenzà di Mayerling (Austria), ri sentato da specie diverse da T aon, Daxatina, genere ritenuto tìpico sulta che il tasso di sedimentazione a Stuores è circa otto volte supe- delle medie ed alte latitudini, risulta pertanto cosmopolita e Tiachyce. riore a quello dei carbonati pelagici della serie austriaca e che h pri ras) taxon delle medie e basse latitudini, viene confermato in livelli ma presenza di D. cf. canadensis può cadere nella pane inferìore della che precedono le faune ad Aon. Nella sezione è stata definita una Zona a Diebeli della suddetta serie. Sulla base degli ammonoic{i, degli nuova unità. biostratigrafica, 1a Subzona a Daxatina cf. canadensis altri gruppi fossili e dei dati rnagnetostratigrafici unìt:rrnente ai requr- (Zona a Trachyceras) Carnico, nella presenf,r riferibile al quale sono siti storici, si propone rl FAD di Daxatina corne mr.ker della base "Anolcites" anche ex gr. laricus, fustoceras n. sp. A, Asklepioceras e del Carnico e la sezione di Prati di Stuores. come GjSP del lìrnite Muensterites. Il FAD di Daxatina viene indicato come marker del li- Ladinico-Carnico. mite inferiore dell'unità. Tale limite cade all'interno della Fm. di San Cassiano, pochi rnetri al di sopra del limite con la Fm. di La Valle. Abstact. The Prati di Stuores/Stuores -Wiesen section (Dolo- La comparsa di Tiacltyceras aon ne segna il limite superiore. La subzo- mites, Italy) is proposed as a candidate Global Stratotype Section and na è individuabile anche in altre sezioni delle Dolomiti. I conodonti, Point for the base of the Carnian Stage. In addition to being a fa- molto scarsi in tutta la sezione fino a mlncare nella pane bassa della mous, richly fossiliferous localitn it includes the type-section of the Subzona a D. cf. canadensis, si inquadrano nella Zona di associazione Cordevolian substage. The section is located near Pralongià, along a Budurnignatus diebeli. GondoLeLla poLygnatbiformis, segnalata nella the southern slope of the crest selìrr!Ìting the Badia/Abtei and Corde- Subzona ad Aon, manca sia nella Subzona a Regoledanus sia in quella vole valleys. Below the levels witb Tiaclryceras d.on, the secrion con- a D. cf. canadensis; il suo significato di marker della base del Carnico, tains a rich ammonoid fauna that characterizes the upper parr of rhe come proposta in questo lavoro risulta discutibile. Nella ricca palino- Regoledanus Subzone and subsequently records the first àppearances flora presente poco sopra il FAD di Dautina sr individua la fase a of the mìd-high latitude genus Daxatina (Daxatina sp., D. cf. canaden" vigens -densus, già segnalata nella Subzona ad Aon. I foraminiferi ben- sls) and of traditional Tracbyceras wìth species different from T actn. tonici (sezioni sottili e iavati) sono rappresentati da specie nore so- Therefore, the Daxatina cf. canadensis Subzone is recognised above prattutto nel Carnico della Tetide. Alcune specie ad affinità carnica the Regoledanus Subzone. Very rare conodonts of the Budurwignatus sono già presenti al di sotto della prina comparsa di Daxatina (es. group and species of Gladigondolella from the diebeli Assembl.age Gsollbergella spiroLoculiftrmis). I bivalvi appartengono a tre morfotipi Zone occtr. GondoleLla polygnathtfurmis, already known from the di Posidoniidi ("Posid.onia" uengensis, "P" cf , uengensis, ? Halobia).I Aon Subzone, is absent. Palynornorphs, foraminifers, gastropods, bi- 1) Dipanimento di Scienze Geologiche e Paleontologiche - Università di Ferrara - Corso Ercole I d'Este, 32 - 44laA Ferrara E-mail: [email protected] 2) Dipartimento di Scienze della Terra - Università di Perugia -Ptazza dell'Università - 06100 Perugia. 3) Dipartimento di Geologia, Paleontologia e Geofisica - Università di Padova - Via Giotto, 1 - 35132 Padova. 4) Dipartimento di Scienze della Terra - Sezione Paleontologia - Università di Modena - Via Università,4 - 41100 Modena. 5) Institute of Geophysics - ETH Hoenggerberg - 8093 Zùrich. 38 C. BrogLio Loriga et al. Fig. 1 - Location of the Prati di Stuores/Stuores ^ Cassiano\9 Sliesen area PIZ LA VILLA rnd sr rarigrephic secrions. ,' .2078t8/ ì- t/ l \q Sections 1 and 1 bis corre- _-_a spond to rhe column in Fig. I I and 13. Section 2 corre- I ,i sponds to the Stuores $íre- "."Í):N] sen section in Urlichs (1974, i >-( /-\!, ) /Q 1.994) and to section SW5 in ''lt ly- )) Neri et al. (1995). \r\\! ge, in lccordance wirh rhe gui- |I \\ /;--*d--=\\ ,!"- \ delines for establishment of GSSP (Remrne er al., 1996). The Stuores section consists of .1, two parts (Fig. 1, and 3). The 'westernmost part, herein named valpafo a section l. corresponds exactJy SETISASS with section SV4 of Neri et al. ,l (1995) and with the section i1lu- \ ..-----".. \ Q 1"" 2 3Km strated by De Zanche & Gianol- la (1995) and by Mietto Er Man- frin (1995b). The latter extends wIr*N downward for about 20 m be- low stake 1, which marks the base of the section described in this paper. The top of section L may be correlated to a short section (section 1 bis) located slightly to the east and separa- ted from section i by faults of modest throw. Section 2 lies further to the east and corre- sponds to the Stuores Wiesen section of Urlichs (1974, 1994) and to section SW5 of Neri et al. (1995). Due ro recronic omis- sion, the base of secrion 2 can- j\Frl\^./ \ \.r-.< / not be correlated with the top r P SoOm of section 1bis. Further details t:: on the relationships between the Stuores section as used he- vaives, brachiopods, microcrinoids and holothurian sclentes were stu- rein and the section in Urlichs (1974, 1994), s/ere given died. Variations in frequency and taxonomic diversity of these faunas by Neri et al. (1995). In the present paper, rhe rerm suggest anaerobic-disaerobic bottom conditions for the lower-middle pan of the section (0-105 m), followed by a more stable oxygen con- section 1 and lbis refers ro the Prati di Stuores/Stuores \Wiesen tent in the upper portion. Magnetostratigraphy showed four intervals section. The section supplied a rich ammonoid with normal polarity and three interuals with reversed polarity. The fauna which predates the first appearance of Tiaclryceras Daxatina cf. canadensis Subzone falls close to the normal polarity and includes the genus Daxatina, a taxon particuiarly interval S2n. The present study proposes the FAD of the cosmopoli- significant in global correlations (Mietto Manfrin, trn genus Daxatina xs the marker of the base of the Carnian Stage, & placing it at a lower stratigraphic level than previously indicated in 1995a, b). This cosmopolitan genus allows correlations the Stuores area. The Prati di Stuores section is proposed as GSSP of between different paleolatitudinal provinces. The use of the Ladinian-Carnian bounciarv. its first appearance as a criterion for recognizing the base of the Carnian Stage is proposed, which would pla- ce this boundary at a stratigraphic level lower than pre- lntroduction. viously adopted in the same area (cf. Urlichs, 1974, The Prati di Stuores/Stuores ltriesen section (Do- 1994; Krystyn, 1978). lomites, Italy) is proposed as a candidate Global Strato- The Stuores section 1 was marked permanently type Section and Point for the base of the Carnian Sta- with twenty stakes to permit accurate localisation of the Prati di Stuores section, a GSSP candidate 39 . Pruri di Stuores,/Sruores Wi.- sen section at the head of the Cordevole valley. Setfsqss sampling sites. Other fossil groups, magnetostratigraphy varian Alps near Berchtesgàden, less than 20 km south and sequence stratigraphy were investigated recently, of Salzburg (e.g. Allasinaz, 1964). Differences and/or discrepancies with previous studies No substantial modifications were made to this (e.g. Mretto & Manfrin, 1995b; De Zanche & Gianolla, scheme until the sixties.
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