Radiograph of the upper part of core 223, consisting of varved late-glacial clay and sampled just below the bottom of a clay pit at Bergsbrunna (just southeast of Uppsala).

Varve no. according to the De Geer chronology. The film-density curve also shows bulk-density variations along the centerline of the radiograph. Varves like varve no. -763, reflecting special melting conditions, are very useful for the core-to-core correlations. The light dots in the radiograph of the winter part of the varves no. -766 and -765 are particles of CaCO₃. Mean mass sedimentation rate during the 6 sedimentological years -765 to -760 = 38 kg of solids/m²/year. A Joyce-Loebl transmission densitometer was used for recording variations in the film density along the centerline of the radiograph.

Back.

Back to my front page.