Collections of Isaak Martinus Van der Vlerk
About I.M. Van der Vlerk (1892-1974)
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Reference collection to Van der Vlerk, I.M. (1922). Studien over Nummulinidae en Alveolinidae. Haar voorkomen op Soembawa en haar beteekenis voor de geologie van Ooost-Azie en Australie. Proefschrift, Faculteit der wis- en natuurkunde, Rijksuniversiteit te Leiden. Verhandelingen v.h. geologisch-mijnbowkundige genootschap van Nederland en Kolonien, Deel V, Blz. 329-364.
[Ex Slg. 30, Aussereuropäische Geologie]
During the first decades of the 1900-ies the Netherlands 's Lands Mijndiensten in Nederland Oost Indie assembled extended geological collections from various areas in the Indonesian Archipelago, among them also from Sumbawa. These collections comprised petrographic, mineralogical, volcanic, sedimentological and ore- and coal collections. In the time about 1912-1913 such collection from Sumbawa was donated by Dr. J.J. Pannekoek van Rheden to the Natural History Museum in Basel, where it was integrated in the "Abteilung Aussereuropäische Geologie". This collection was the basis from which Isaak M. Van der Vlerk selected the materials for his dissertation Studien over Nummulinidae en Alveolinidae in 1922.
Until January 2016 the specimens described and illustrated in Van der Vlerk (1922) from Sumbawa were deposited as two separate parts within the Indonesia collections of the NMB: One part was Pannekoek van Rheden's "hand specimen collection" comprising all different types of rocks and lithologies from Sumbawa. The other part was mainly a collection of "fossils and sediments" from Sumbawa. The former is in partem described in part 2 (p. 71 ff) of the dissertation. The latter contains a major collection of about 300 thin sections, that are described and illustrated in the dissertation.
Because in 2015 it was decided to relocate the Indonesia collection to the external deposit in Münchenstein, the Indonesia collections underwent inventarization, during which the thin section collection to the dissertation of van der Vlerk (1922) was separated out from the Indonesia collections and integrated into the micropaleontological collections. The original rock slices, from which the thin sections were cut were left together with the remaining macrofossils in the collection to J.J. Pannekoek van Rheden (1912-1913), Sumbawa, collections from Indonesia.