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Rubble zone at a cycle boundary, Goldberg Formation, Mt. Salève.
THE PURBECKIAN OF THE FRENCH JURA
MOUNT SALÈVE
Photographs of cyclicity in the Tidalites
de Vouglans, Goldberg, Pierre Châtel, Vions and the Chambotte Formations
at Mt. Salève (20 km south of Geneva). Measured thicknesses are from the column
of Strasser and Hillgärtner, 1998.
Salève north-west
face.jpg
The Purbeckian is found in the upper half of the
northwest face of Mount Salève.
4th
order boundary 23m.jpg
The numbers at 23 meters represent the boundary
between 400 ka sequences 1 and 2 of Strasser and Hillgärtner (1998, Figure 7)
and 100 ka sequences 4 and 5. This herein also interpreted as a 4th order
(400 ka) sequence boundary and A, B and C are 100 ka sequences above the
boundary.
3rd
order boundary 41.9m.jpg
A third order boundary near the base of the Goldberg Formation
occurs at 41.9 meters of the Strasser and
Hillgärtner column. This 3rd order sequence (2 ma) is the equivalent of
the condensed 3rd order sequence at Stair Hole Dorset below the position of the
'Mammal bed'.
4th
order boundary 61m.jpg
This fourth order boundary is just on top of the
thick polygonal mud cracked interval at 61 meters on the Strasser and
Hillgärtner column (at their 2/3 400 ka boundary).
4ths
I to IV in the Goldberg.jpg
The Goldberg Formation 3rd order sequence. The
61 meter 4th order boundary (between the second and third 4th) is (colored
yellow) at the grass covered bench high on the center of the face.
3rd
order boundary Goldberg-PC.jpg
Massive limestone of the Pierre Châtel overlies
rubble and soil zone at the top of the Goldberg 3rd order sequence. This
horizon corresponds to the 'Mammal bed' 3rd order boundary in Dorset.
3rd
order boundary Vions-Chambotte.jpg
Massive limestone of the Chambotte overlying the
Vions Formation. The foot path is at 139 meters on the
Strasser and Hillgärtner column, 11 meters below the base of the
Chambotte. The base of the massive Chambotte is correlative with the base
of the Broken Shell Limestone of Dorset.
CHAPEAU DE GENDARME
Photographs of the the section at Chapeau
de Gendarme showing the massive limestone of the Pierre Châtel Formation and
two 5th order sequences in the lower Vions Formation.
The Chapeau
(Pierre Châtel Formation).jpg
The massive limestone of the Pierre Châtel Formation
makes up the cliff in the shape of the policeman's hat. It consists of two
4th order sequences plus the base of a third 4th order.
5th
order sequences in the Vions.jpg
Two distinctive 100 ka sequences low in the Vions
Formation at the Chapeau de Gendarme section.
LAVANS
Photograph of major soil at the Goldberg -
Pierre Châtel 3rd order boundary.
3rd
order boundary soil.jpg
YENNE
Photographs of 5th order sequences in the
Goldberg Formation at Yenne and the soil at the Goldberg-Pierre Châtel 3rd
order sequence boundary.
5th order
sequence 0m.jpg
The mud cracked interval at the base of this exposure
correlates with the mud cracked interval at 61 meters at Mt. Salève (a 4th
order sequence boundary).
Two
5th order sequences Goldberg.jpg
Well developed rubble zones (karsts) on the top of
100 ka sequences. Internal 20 ka cycles are visible.
3rd
order boundary top Goldberg.jpg
Major rubble zone and soil at he Goldberg - Pierre
Châtel boundary. This exposure surface also is seen at Lavans and at Mt.
Salève.
