ExpOOs / Maison des Minéraux

Nodule

amenez, Google Translate — 2023-06-29T10:49:26Z

Silurian nodule (-410 million years) from black shales located in Argol. The iron oxides in visible surface of the sample indicate the presence of pyrite. This nodule in the exhibition are the biggest concretion discovered in Crozon Peninsula .

- Geology of "La presqu'île de Crozon"

Pillow lava

mcleaud — 2023-06-29T10:34:29Z

This pillow lava testifies to a period of underwater volcanic activity in the Crozon Peninsula -448 million years ago.

- Geology of "La presqu'île de Crozon"

Rhythmic graded breccia

mcleaud — 2023-06-29T10:26:51Z

This rock corresponds to the fallout of volcanic products in the marine environment classified according to their size (grading).
The black volcanic particles are cemented by a white limestone matrix.

- Geology of "La presqu'île de Crozon"

Dolerite samples

amenez, Google Translate — 2014-02-19T10:34:56Z

Dolerite is a rock vein. It corresponds to the cooling of magma injected into fractures within a few hundred meters deep.The alteration of the dolerite usually results in a series of concentric scales "onion skins", and a very pronounced oxidation.

01 - Dolerite ball oxidized

02 - Dolerit pebble

From -475 million years ...

amenez — 2014-02-03T11:53:24Z

Traces of animal activity

01 – Bilobites ou Cruziana (bilobed traces of marine worms) (Camaret)

02 – Vertical burrows of marine worms (Camaret)

Graptolites

Animals planktonic marine fossils

03 – Didymograptus (Camaret)

Brachiopods

Animals bivalve shells, attached to the substrate by a pedicle.

04 – Nicolella actoniae

Bivalves

These mollusks with two valves usually have bilateral symmetry

05 – Redonia

Trilobites

These primitive arthropods have disappeared at the end of the Paleozoic Era.

06 – Ileanus giganteus

07 – Ileanus giganteus

08 – Neseratus tristani

09 – Neseratus tristani

10 – Neseratus tristani

11 – Calymene aragoï

12 – Dalmanites

13 – Asaplius armoricanus

Tracks of marine worms

amenez, Google Translate — 2014-02-03T11:34:04Z

Fossilized tracks of marine worms

- Geology of "La presqu'île de Crozon"

Fossilized ripple-marks

amenez — 2014-02-03T11:28:02Z

Traces left by the sea on the sand and fossilized.

- Geology of "La presqu'île de Crozon"

Limestone coral

amenez, Google Translate — 2014-02-03T11:21:53Z

Block of limestone containing fossils of corals.

- Geology of "La presqu'île de Crozon"

The peninsula of Crozon is not a land of granit !

amenez — 2014-01-30T17:33:09Z

Sandstones and quartzites (hard rocks) constitute the main capes while shales outcrops and faults-zones are widely eroded by the sea.

A consequence of plate tectonics in Britain: rock deformation

amenez — 2014-01-30T17:23:11Z

All sedimentary rocks are horizontal when first laid down. In instable regions of crust, the stratas have been folded, squeezed and fractured, processes collectively called deformation. The way in which rocks deform under stress is determined by their composition, the temperature and pressure under which they are confined, the pressure of water contained in pores in the rock and strain, that is the amount by which the rock is compressed in a given time.

Place : La Mort Anglaise's upfold in Camaret