Cephalopods

1. Ammonite

Upper half of a cross-section of an ammonite biomould filled by a crinoidal wackestone from Jurassic basinal facies. The original shell composition was aragonitic and replaced by calcite spar.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

2. Ammonite

Skeletal packstone with fragments of ammonites from Jurassic basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

3. Ammonite

Skeletal wackestone/floatstone with a section of ammonite geopetally filled by carbonate mud matrix and calcite spar associated with skeletal debris of bivalves, brachiopods and echinoderms.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)

4. Ammonite

Skeletal wackestone to packstone with an ammonite cross-section on the left, bivalve shells on the right and a crinoid fragment in the upper right corner.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)

5. Ammonite

A particular of a fragment of ammonite shell replaced by calcite spar because of its original aragonite composition in a peloidal packstone.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)

6. Apthycus

Skeletal wackestone from upper Jurassic basinal facies with an apthycus of ammonite (centre left) associated with thin-shelled bivalves. Apthyci were originally calcitic in composition.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

7. Ammonite

Skeletal wackestone from a Jurassic slope facies showing in the centre left a section of ammonite shell filled by prismatic radial fibrous cement followed by limpid blocky sparite.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)

8. Ammonite

Skeletal peloidal packstone from Jurassic outer ramp facies showing a cross-section of an ammonite.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)