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The Lochkovian-Pragian Boundary in the Lower Devo~Ian of the Barrandian Area (Czechoslovakia)

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The Lochkovian-Pragian Boundary in the Lower Devo~Ian of the Barrandian Area (Czechoslovakia) ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at Jb. Geol. B.-A. ISSN 0016-7800 Band 128 Heft 1 S.9-41 Wien, Mai 1985 The Lochkovian-Pragian Boundary in the Lower Devo~ian of the Barrandian Area (Czechoslovakia) By Ivo CHLUpAC, PAVEL LUKES, FLORENTIN PARIS & HANS PETER SCHÖNLAUB*) With 17 figures, 1 table and 4 plates Tschechoslowakei Barrandium Karnische Alpen Devon Stratigraphische Korrelation Lochkov-Prag-Grenze Tentaculiten Conodonten Graptolithen Chitinozoa Trilobita Brachiopoda Contents Summary, Zusammenfassung . .. 9 1. Introduction..... .. 9 2. Description of sections 10 2.1. Cerna rokle near Kosoi' 10 2.2. Trebotov - Solopysky 13 2.3. Praha - Velka Chuchle (Pi'fdol f) 14 2.4. Cikanka quarry near Praha-Slivenec 17 2.5. Radolfn Valley - Hvizaalka quarry 19 2.6. Oujezdce quarry near Suchomasty 22 3. Stratigraphic significance of some fossil groups in the Lochkovian-Pragian boundary beds of the Barrandian 22 3.1. Dacryoconarid tentaculites (P. LUKES) 22 3.2. Conodonts (H. P. SCHÖNLAUB) 24 3.3. Chitinozoans (F. PARIS) 27 3.4. Graptolites 28 3.5. Trilobites 28 3.6. Brachiopods 29 3.6. Some other groups 29 4. Proposal for a conodont based Lochkovian-Pragian boundary 30 5. Conclusion 30 References 32 Zusammenfassung Summary Im Barrandium Böhmens wurde die Lochkov/Prag-Grenze Six selected sections of the Lochkovian-Pragian boundary des Unterdevons an 6 ausgewählten Profilen in Hinblick auf ih- beds in the Barrandian area of central Bohemia were subject- ren Makro- und Mikrofossilinhalt biostratigraphisch untersucht. ed to investigations of mega- and microfossils. Joint occur- Für Korrelationszwecke sind in erster Linie Dacryoconariden, rence of different stratigraphically important fossil groups, par- Conodonten, Chitinozoen, Trilobiten, Graptolithen und Bra- ticularly dacryoconarid tentaculites, conodonts, chitinozoans, chiopoden geeignet. Die traditionelle Lochkov/Prag-Grenze trilobites, graptolites, brachiopods a. o. allows a correlation liegt innerhalb einer kontinuierlichen marinen Entwicklung, die from different viewpoints. The Lochkovian-Pragian boundary pelagische Kalke wie auch organodetritische Flachwasserkal- as originally defined ist drawn in a conformable succession of ke umfaßt. Faunenabfolge und Evolutionsreihen einzelner marine carbonate rocks which include fine-grained pelagic up Tiergruppen beweisen lückenlose Sedimentationsbedingun- to shallow water biodetrital facies. The faunal relationships gen. Die Lochkov- und Prag-Zeit und im besonderen die Gren- and lineages suggest an uninterrupted development and evo- ze zwischen den beiden Stufen sind durch ihren Fossilinhalt lution. The Lochkovian-Pragian boundary interval and the klar zu charakterisieren. Ausgehend von den Verhältnissen im boundary proper is distinguishable by means of dacryoconarid Barrandium und in den Karnischen Alpen wird eine auf Cono- tentaculites, conodonts, chitinozoans, trilobites, brachiopods, donten basierende Grenzziehung zwischen der Lochkov- und echinoderms etc. A proposal for a conodont based Lochko- Prag-Stufe vorgeschlagen. vian-Pragian boundary is presented. *) Authors' addresses: Ivo CHLUpAC,PAVEL LUKES, Usti'ednf Ustav Geologicky, Malostranske nam. 19, P.O.B. 85, 1. Introduction CS 11821 Praha 1, CSSR; FLORENTINPARIS, Laboratoire de Paleontologie et Stratigraphie, Institut de Geologie, Universite de Rennes, F-35042 Rennes CSdex, France; HANS PETER The Lower Devonian stages Lochkovian and Pragian, SCHÖNLAUB, Geologische Bundesanstalt, Rasumofskygasse established by the first International Symposium on Si- 23, A-1031 Wien. lurian and Devonian in 1958 and accepted as standard 9 ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at stages by the Subcommission on Devonian Stratigraphy Reference collections are deposited in the Geological in 1983, show a complex facies development within the Survey, Prague, Geologische Bundesanstalt, Vienna Barrandian type area in central Bohemia. A predom- (conodonts) and Universite de Rennes (chitinozoans). inance of various kinds of micritic, sparitic, biodetrital and in the Pragian also reefal limestones rich in benthic and pelagic faunas is characteristic (for general data see CHLUpAC, 1976, 1982). The presence and joint 2. Description of sections ocurrence of groups on which the zonal subdivisions are based allow a correlation of different kinds of zonat- Six sections with well exposed and tectonically undis- ion and biostratigraphic features and accentuate the turbed Lochkovian-Pragian boundary interval were se- importance of the Barrandian sections for wide-scale lected within the Barrandian and subjected to a "bed by correlations. bed" study. These sections cover different types of fa- As the Lochkovian-Pragian boundary represents a si- cies development characteristic of the Barrandian area. gnificant limit wihtin the Lower Devonian, a detailed in- vestigation of this boundary was started in 1980 and finished in 1984. The Lochkovian-Pragian boundary is 2.1. Cerna rokle near Kosar exposed in the Barrandian at many places, and conse- quently, the work was concentrated on several sect- Classic Lower Devonian outcrops in the Cerna rokle ions. It is thus merely the first attempt to evaluate the gorge SE of the village Kosor are situated at the SW boundary from mega- and micropalaeontological view- periphery of Prague (for topographic position see points. fig. 1). The work was conducted by the Geological Survey, The sequence, exposed particularly on the NW slope Prague, and realized in terms of international coopera- of the gorge in old quarries and adjacent outcrops, in- tion within the Geologische Bundesanstalt, Vienna, and cludes the upper Lochkovian and Pragian strata. The Laboratoire de Geologie, Universite de Rennes, France. former, developed as the platy Radotin Limestone of Field investigations of sections and biostratigraphic stu- the Lochkov Formation, is accessible in a sequence ab- dy of most part of megafossils were carried out by I. out 40 m thick, the latter, developed as nodular Dvorce- CHLUpAC,study of dacryoconarid tentaculites by P. Lu- Prokop Limestone, is cropping out at a total thickness KES (both Geological Survey, Prague), conodont samp- of 160-180 m. The outcrops are well known palaeonto- ling and studies were made by H. P. SCHONLAUB(Geo- logical localities famous since Barrande's time (report- logische Bundesantalt, Vienna), and of chitinozoans by ed in the 19th century as "Lochkov" - see CHLUpAC, F. PARIS(Universite de Rennes). Some graptolites were 1983), and rich faunas were described in many mono- determined by HERMANNJAEGER(Museum für Naturkun- graphs, beginning with BARRANDE'S(1852). The biostra- de, Berlin), brachiopods by V. HAVLfCEK(Geol. Survey, tigraphy was studied especially by KODYM & KOLIHA Prague), and echinoderms by R. PROKOP(National Mu- (1928), CHLUpAC (1953, 1957, 1962) and SCHONLAUB seum, Prague). (1980). The outcrops serve as the type locality of the :RAHA,1p Velka Chuchle I • o • Cikanka o I I I I o • HVlzd"alka o I ~ I I)" f Kosor o > .....o > o 5 km Fig. 1: Location of the Lochkovian-Pragian boundary sections .• = sections described in this paper; 0 = sections studied during former etapes of investigations; area of Siluro-Devonian outcrops vertically lined. 10 ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at The common occurrence of index graptolites Mono- graptus hercynicus falls within the interval of beds 25 to 28 (shale interbeds), the last specimen probably belonging to this species was found in interbed 57/58. Graptolites found in interbeds 54/55, 57/58 and at the base of bed 77 belong to Monograptus kayseri or M. aequabilis notoaequabi- lis (?), all kindly reviewed by H. JAEGER. Dacryoconarid tentaculites, prolific almost in all the upper Lochkovian limestone beds exposed, are repres- ented by the index Paranowakia intermedia commonly occur- ring up to the bed 74 (rock-forming accumulations in beds 61 and 62); P. geinitziana has been found already in bed 41, its acme-development falls within the interval of beds 74-79; less common occurrence persists up to the lowest Pragian (according to a letter of April 27, 1983, G. ALBERTI found rare specimens of P. geinitziana up to the bed 87). Nowakia sororcula is markedly common in the topmost Lochkovian (beds 75-80 and frequently Fig. 2: Cerna rokle near Kosor, face wall of the old quarry, ori- ginal stratotype of the Lochkovian-Pragian boundary. Topmost continues into the lower Pragian. Species determined Lochkovian in the Radotfn, lowest Pragian in the Dvorce-Pro- as Nowakia cf. acuaria have been found sporadically be- kop Limestone facies. 65 = dark micritic marker bed; ginning with bed 58. Recently described new species of 80 = last Lochkovian bed; 87 = thicker bank of the Dvorce- tentatculites, namely Nowakia kosorensis and N. vesta derive Prokop Limestone with nodular structure. from bed 63 and its proximity, N. praesororcula is common in beds 72-73 (LUKES, 1985). Radotfn Limestone within the Lochkov Formation and Some differences in stratigraphic distribution are according to the original definition from 1958 (see Pra- clearly shown in trilobites: Spiniscutellumm umbilliferum is ger Arbeitstagung etc., 1960, p. 150) the westernmost generally common up to the interval of beds 60-65; quarry (fig. 2) constitutes the holostratotype of the starting with bed 67 it seems to be replaced by S. ? plasi Lochkovian-Pragian boundary beds. which continues up to the end of the Lochkovian se- The sequence of the Lochkovian-Pragian boundary quence. Lochkovella misera,
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