Rift, pull-apart rift and continental drift crossword puzzles across the Lower–Middle Cambrian transition of Iberia and Morocco

Abstract

Rift-controlled erosive unconformities are generally absent outside their involved tilted down-faulted blocks, so interpolating the presence of coeval cryptic unconformities in neighbouring passive-margin basins is questionable. In West Gondwana, the supposed correlation of Moroccan (rifting) unconformities to Iberian (passive margin) cryptic unconformities across the Lower–Middle Cambrian boundary interval is neither constrained nor properly argued.

Keywords::

• stratigraphy
• hiatus
• condensation
• correlation
• Gondwana

Acknowledgements

The author thanks the revision made by Per Ahlberg (Lund) and Samuel Zamora (Washington). This paper is a contribution to project CGL 2010-19491 from Spanish MICINN an EU-FEDER.