ISSN:
1437-3262
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Summary In the core No. 205 (Fig. 1), four divisions (A–D) have been distinguished, each commencing with a bed of volcanic ash which records an epoch of intense activity in the volcanic source region. The volcanic beds are chiefly of two types, viz. 1) beds of wind-born ashes, and 2) masses of pumice floated on the sea and subsequently crushed by the action of the waves. The turbidity current deposits are characterized int. a l. by gravitative grading of a distinctive type, and by an abundance of benthonic micro-organisms. Throughout the sequence, the pelitic sediments are characterized by the paragenesis: illite, kaolinite, and montmorillonite. The boundary between Divisions C and B markes an important change in the geographical milieu, recorded in the stratigraphy of the core not only petrographically but also biologically.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01802328
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