Crenularis-Member

Zur Übersicht

Darstellung, Status

Index
-
CMYK-Farbe
cf. Villigen-Formation
RGB-Farbe
R: 185 G: 195 B: 215
Rang
lithostratigraphisches Member
Gebrauch
Element ist in Gebrauch
Status
gültiger formeller Begriff
SKS-Notiz
-
SKS-Datum
-
Kommentar
-

Nomenklatur

Deutsch
Crenularis-Member
Französisch
Membre à Crenularis
Italienisch
Membro a Crenularis
Englisch
Crenularis Member
Herkunft des Namens

Namengebendes Fossil: Echinoidenart Hemicidaris crenularis (Lamarck) Agassiz.

Historische Varianten
Crenularisschichten (Moesch 1863 S.157, Tobler 1905 Tab.4a, Disler 1941), couches à Hémicidaris crenularis (Boyer 1885), Crenularis Schichten = Zone à Peltoceras bicristaum p.p. (Haug 1911), Crenularis-Schichten (Hantke 1967), Crenularis Member (Gygi 2000c), Couches à Hemicidaris crenularis
Nomenklatorischer Kommentar
-

Synonyme

Synonyme
Nicht-Synonyme
Verwechslungsgefahr

Beschreibung

Beschreibung
Das Crenularis-Member besteht aus Kalksteinen. In den glaukonitischen Lagen kommen lokal Schwammnadeln vor.
Geomorphologischer Ausdruck
-
Mächtigkeit
Ca. 3-4,5 m ; 17 m bei Mellikon in atypischer Fazies (Schwamm-Bioherm ; Gygi 1969)

Komponenten

Lithologien
  • Kalkstein
Mineralien
  • Glaukonit
Fossilien
  • Schwämme
  • Echinoideen
  • Bivalven

Hierarchie und Abfolge

Übergeordnete Einheit
Villigen-Formation
Untergeordnete Einheiten
Laterales Äquivalent
Obergrenze
-
Untergrenze
-
Stratigraphische Diskussion
Nach Gygi (1969) ist die Mächtigkeit des Crenularis-Members 17 m im Steinbruch von Mellikon, aufgrund von Schwamm-Riffen. Diese atypische Fazies markiert den Übergang zum Hornbuck-Member weiter östlich.

Alter

Alter Top
spätes Oxfordien
Bermerkungen zu Top
-
Alter Basis
spätes Oxfordien
Bermerkungen zu Basis
-
Datierungsmethode
Biostratigraphie: Ammoniten der Berrense- bis Bimammatum-Zone (Gygi 2000b/c). Bimammatum-Subzone (Enay et al. 1988).

Geografie

Paläogeografie
Von Oftringen im Westen bis Lägern im Osten und im Aargauer Tafel-Jura.
Typusregion
Typlokalität
  • Villiger Geissberg (AG)
    Merkmale des Ortes
    • typical facies
    Zugänglichkeit des Ortes
    • road cut
    Koordinaten
    • (2657785 / 1264055)
    Notizen
    • Kote 510 m (Gygi 1969 S.69 Profil RG62), Kompositprofil
Typusprofil
  • Villiger Geissberg (AG)
    Merkmale des Ortes
    • typical facies
    Zugänglichkeit des Ortes
    • road cut
    Koordinaten
    • (2657785 / 1264055)
    Notizen
    • Kote 510 m (Gygi 1969 S.69 Profil RG62), Kompositprofil
Referenzprofile
  • Gabenchopf (AG)
    Merkmale des Ortes
    • typical facies
    Zugänglichkeit des Ortes
    • quarry
    Koordinaten
    • (2656965 / 1265050)
    Notizen
    • 2 km NW Villigen (Gygi 2000c)
Point of interest
-

Paläogeografie und Tektonik

Paläogeografie
Aargauisches Becken,
Herkunftstyp
  • sedimentär
Bildungsbedingungen
"argovien" / "séquanien"
Sequenz
-
Tektonische Einheit (bzw. Überbegriff)
Jura
  • Süddeutschland
  • Schwarzwald
  • Jura méridional
  • Vogesen
Metamorphose
unmetamorph
Metamorphosefazies
-
Bemerkung zur Metamorphose
-

Referenzen

Erstdefinition
Moesch Casimir (1863): Geologische Beschreibung des Aargauer-Jura und der nördlichen Gebiete des Kantons Zürich. , Beitr. geol. Karte Schweiz 4

S.157
Neubearbeitung
Gygi R. A. (2000): Annotated index of lithostratigraphic units currently used in the Upper Jurassic of northern Switzerland. , Eclogae geol. Helv. 93/1, 125-146

p.129: Crenularis Member (Moesch 1863) ; Member of the Villigen Formation Moesch (1863. p. 157) named the Crenularis Member (Crenularisschichten) that became well-known because ofthe geological maps by Mühlberg. The name is derived from the echinoid Hemicidaris crenularis (Lamarck) that rarely occurs in the member. Moesch (1863 and 1867) did not indicate a type locality. Gygi (1969. p. 69) declared his section RG 62 along the road from Villigen to Mt. Geissberg, Canton Aargau, to be the type locality of the member. The road there crosses the well-exposed Crenularis Member at the elevation of about 510 m at coordinates 657.890/264.040, LK 1070 Baden. This section is however unfavorable as a type section, because the outcrops along the road are discontinuous. The continuous section RG 62 was assembled from five partial sections that were measured on both sides of the short valley through which the road runs. The locations of the partial sections are indicated in Gygi (1969. p. 61-62). A good and complete outcrop of the typical Crenularis Member is at present accessible in the upper part of the large quarry west of Gabenchopf 2 km westnorthwest of Villigen (LK 1070 Baden). This quarry can serve as reference section.
The Crenularis Member is a biomicritic limestone with uneven bedding planes and a knobby weathering. According to Gygi (1969. Pl. 19). the mean thickness of the member is 3 m. It contains siliceous sponges and abundant bivalves, mainly of the genus Pholadomya. Ammonites are rather rare, but the mineral glauconite is always present. The member is dated biochronologically by the ammonite Epipeltoceras cf. bimammatum (Quenstedt) J 31726 in the Museum of Natural History Basel that was found by Moesch and figured by Gygi (2000b, Pl. 10. Fig. 5). The ammonite is from bed 31 in the unpublished section RG 36 of Fahr quarry at Auenstein. Canton Aargau, LK 1089 Aarau. It documents the early Bimammatum Subchron. The Crenularis Member can be followed from Oftringen, Canton Aargau in the west to east of Burghorn on Mt. Lägeren east of Baden. Canton Aargau (Gygi 1969, p. 70). In the tabular Jura of Canton Aargau it extends to Baldingen.
The thickness of the member greatly increases to 17 m near Mellikon. Canton Aargau (Gygi 1969. Pl. 17 and 19) because of the growth of sponge bioherms. This is an atypical local facies which is transitional to the Hornbuck Member in the Klettgau valley. In the proximal direction (to the west), the Crenularis Member can be traced into the lowermost Olten Member of Gygi (1969) that was also called Crenularis Member by Moesch (1867, p. 150).

Wichtige Publikationen
-

Material und Varia

Anwendungen
-