Notes on Freshwater Coated Grains of the Hengchun Peninsula
Other Title
恆春半島淡水包殼粒簡記
Journal
Collection and Research
Journal Volume
33
Start Page
29
End Page
40
ISSN
1726-2038
Date Issued
2020-12
Author(s)
Abstract
This research focuses on the geographical distribution and occurrence of freshwater coated grains on the Hengchun Peninsula. Field surveys showed that coated grains were mainly distributed in areas with spring water seepage in Siangjiao Bay and the Gongyuan Road Reservoir, and a small amount has developed at Fongchuisha. Most coated grains were well-rounded with a smooth surface. However, those which had grown in the catchment sedimentation sink of the Gongyuan Road Reservoir site are unique. Each has a peculiar outer layer composed of short dense branching protrusions. The results of rock thin section and electron microscope inspections showed that the formation of these two types of coated grains is by intermittent rolling and the growth of microorganisms on the top of the grain. Their quite different appearances may reflect the relative stability of the growth substrates.
Subjects
恆春半島
包殼粒
核形石
淡水碳酸鹽
湧泉
coated grains
freshwater carbonates
Hengchun Peninsula
oncoid
spring water
Publisher
國立自然科學博物館
Type
journal article