Fossil molluscs from the Middle Miocene of Öhningen, southwestern Germany

Salvador, Rodrigo B.; Höltke, Olaf; Valentas-Romera, Bárbara L.; Rasser, Michael W.

doi:10.12657/folmal.030.010

Cited by 1 publication

(1 citation statement)

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“…One specimen stems from the Toarcian (Early Jurassic) of Grassel (Zessin, 2010) in the municipality of Meine, near Braunschweig (northern Germany). The remaining specimens come from the Miocene fossil site Öhningen (e.g., Salvador et al, 2022) located in the Öhningen municipality, near Lake Constance (southern Germany).…”

Section: Methodsmentioning

confidence: 99%

Flatbed scanners as versatile tools for studying surface details of compression fossils

Schädel,

Schubert

2024

Palaeontol Electron

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Compression fossils can be challenging to interpret, especially when necessary information is not apparent from colour alone, e.g., when there is little organic matter preserved. In this case, the shape of the fossil's surface can often still provide much information about the morphology of the preserved organism. Stereo photography and recording images with incident light from different directions (Multi Light Image Collections) are suitable methods to retrieve surface details for inspection or further processing. It has been shown that CCD-type flatbed scanners (one of two widespread scanner architectures) act as cameras with cylindrical projections. The displacement of subjects perpendicular to the scanning direction allows capturing stereographic image sets, like using regular photographic camera lenses, which approximate a point projection. This technique is particularly well-suited for documenting compression fossils. As most CCD-type flatbed scanners illuminate the scanned area with a single movable lamp, the resulting images are evenly illuminated from one direction. This can be utilized to create Multi Light Image Collections by rotating the subject on the scanner surface. When rotated by defined angles, standard photometric stereo programs can be used to retrieve digital models of the surface, such as normal maps (a graphical representation of the surface shape). While consumer grade CCD-type flatbed scanners are not suited for all size ranges of fossils and desired image magnifications, for many compression fossils they can serve as a versatile tool for documenting surface shapes, especially when dedicated imaging equipment is unavailable.

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Section: Methodsmentioning

confidence: 99%