Mechanical and chemical preparation techniques applied to Frasnian Cephalopods from Lompret (Belgium)

Abstract

When embarking on a preparation project it is essential to consider a variety of techniques. A combination of different mechanical and chemical treatments may be necessary, even within the same formation. This article explores this principle using a case study of large accumulations of Frasnian cephalopods collected between 2015 and 2021 from the active quarry of Lompret near Chimay (province of Hainaut, Belgium). The quarry comprises strata that can be linked to the Kellwasser event, an important mass-extinction event near the Frasnian-Famennian boundary. Several of the lithological entities from this quarry require specific approaches in terms of preparation. This article will explicitly focus on preparation techniques applied to cephalopods. This informative and diverse group of macro-organisms can contribute to a better understanding of marine environmental changes during an ecological crisis. A thorough preparation of all the collected specimens from this specific location is required, as this peculiar fauna is in desperate need of a taxonomic review. We will demonstrate to what extents the uses of potassium hydroxide (KOH) and Rewoquat W 3690 PG as solvents have proven to be particularly effective in dissolving clay-rich sediments during preparation.