Boundstone

1. Framestone

Coral boundstone (framestone) with massive coral colony encrusted by serpulids forming a rigid framework surrounded by marine cement.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)

2. Framestone

Coral boundstone (framestone) with branching phaceloid coral colony forming a rigid framework surrounded by micrite crusts.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)

3. Bafflestone

Algal boundstone with in situ vertically growing organisms baffling sediment (beresellid algae).

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

4. Bindstone

Algal boundstone with encrusting binding organisms such as coralline red algae.

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

5. Microbial boundstone

Laminated clotted peloidal micrite and microsparite microbial boundstone (stromatolite) with peloids less than 60 microns formed by precipitation from an aquatic solution by possibly biologically induced/influenced precipitation processes in microbial biofilms and degrading organic matter.

Permian, New Mexico, USA

6. Microbial boundstone

Clotted peloidal micrite and microsparite boundstone with peloids (less than 60 microns in size) precipitated from marine water due to likely biologically induced/influenced processes; primary framework cavities filled by radiaxial fibrous cement.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

7. Microbial boundstone

Clotted peloidal micrite and microsparite boundstone with peloids (less than 60 microns in size) precipitated from marine water due to likely biologically induced/influenced processes; cavities sustained by peloidal micrite filled by radial fibrous cement.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

8. Microbial boundstone

Clotted peloidal micrite and microsparite boundstone with peloids (less than 60 microns in size) precipitated from marine water, sustaining a framework consisting of phylloid algae and cavities filled by radiaxial fibrous cement.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

9. Microbial boundstone

Clotted peloidal to structureless micrite (leiolitic) boundstone including bryozoans.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

10. Microbial boundstone

Homogeneous structureless (leiolitic) to clotted peloidal micrite (microbial boundstone) sustaining primary voids and including a fenestellid bryozoan. This texture is characteristic of Tournaisian middle ramp Waulsortian mounds.

Mississippian, Ireland

11. Microbial boundstone and cementstone

Clotted peloidal micrite crusts separating hemispherical marine cement structures. Diagenetic texture non obliterative dominated by cement spar (neomorphic on early marine botryoidal aragonite) and peloidal micrite.

Permian, West Texas, USA

12. Biocementstone

Boundstone formed by in situ organisms forming skeletal scaffolding (bryozoans) and early marine radial/radiaxial fibrous cement > 50%.

Mississippian, Ireland