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Lake Xiaolongwan

Country: China
Region: Longgang Volcanic Field
Varve Category: biogenic varves
Archive Type: lacustrine sediments
Lake Type: maar
Elevation: 655.0
Length of Record: 1500
DOI / Reference Link: Access Link
Reference: Chu GQ, Sun Q, Rioual P, Boltovskoy A, Liu Q, Sun PQ, Han JT, Liu JQ, 2008. Dinocyst microlaminations and freshwater “red tides” recorded in Lake Xiaolongwan, northeastern China. Journal of Paleolimnology, 39: 319-333.
Picture Authors: Guoqiang Chu

Description: Dinocyst varve from Lake Xiaolongwan, northeastern China, consisting of light- and brown-colored laminae in the thin sections. The brown-colored layer is composed mainly of dinoflagellate cysts. The grey-colored layer consists of other organic (plant detritus, diatoms, chrysophyte cysts) and clastic matter. A: Flatbed scan of a thin section; B: Detail of laminations from the marked area in A analysed microscopically with transmitted light; C: Enlarged detail of B with transmitted light.
Picture Type: microscopic
microscopic picture

Description: Scanning electron microscopic image of dinoflagellate cysts in Lake Xiaolongwan. A: Cyst showing antapical archeopyle; B: Detail of cyst wall, showing very fine ornamentation in the surface; C: Cyst showing paraplate structure, similar to the theca of Peridinium inconspicuum. D: View of the large archeopyle; E: Cyst with large archeopyle and impressed structure; F: Cyst showing a paraplate structure.
Picture Type: microscopic