Definitions of Pre-Pleistocene formation names in Java

Pleistocene formations are in a separate file

INDEX

Damar Series, Discocyclina Beds, Domas tuffaceous sandstone Mbr., Djogjakartae Beds, First Breccia-Horizon, First Marl-Tuff Horizon, Gamping Beds, Genteng Beds, Globigerinen formatie (or GL), Gunung Butak Beds, Gunung Gombel Beds, Gunung Kebo Beds, Gunung Semilir Beds, Gunung Wungkal Beds

 DAMAR SERIES (Formation) (Damar Serie) Pliocene

Bemmelen (R.W. van) (1941). Toelichting bij Bladen 73 (Seinarang) en 74 (Oengaran), Geol. kaart van Java, 1/100.000, pp. 38-45.

The Damar Series consists of four parts, sometimes including intermediary layers, forming the upward passage from the marine neritic Kalibiuk Beds to the Damar Series proper, which has a terrestric facies. This passage is characterized by a zone of intertonguing, which zone may have a thickness varying between 0-600 m. The intermediary layers consist of grey and black clays, often with small marly concretions; intercalations of tuffaceous sandstones and pebble beds, and some lignitic beds. The tuff-sandstones are little hardened, and contain freshwater molluscs comparable with those of the Kali Glagah Beds in the W part of the N Serayu Range.

A section is described from the Kripik river, S of the village of Sukorejo:

Overlying the Kalibiuk marls and clays, with on top a bed of calcareous tuff marl, containing thick-shelled marine molluscs are

1. Intermediary layers (transition zone).

Black clay with calcareous concretion, and a tuff-sandstone with marine molluscs. Upwards the clay contains more and more intercalations of tuffaceous sandstones and conglomerates, with Melania (brackish water). On top lie basal conglomerates of the Lower Damar Beds.

2. Lower Damar Beds: At the base they consist of one or several layers of conglomerates of polymict composition with a calcareous cement. Then follow tuffaceous sandstones and conglomerates of andesites, partly cemented by calcareous material, partly uncemented. Together with the Intermediary Layers, the thickness may attain 800 m. They may be correlated with the Kali Glagah Beds from the Bumiayu region.

3. Middle Damar Beds. Augite-olivine basalt breccias of varying thickness. In the South the M. Damar Beds are represented by lahar deposits.

Towards the N, in the Candi hills of S Semarang, an intercalation of fluviatile, cross-bedded tuffaceous sandstones, conglomerates and lapilli-tuffs, divides the coarse breccias into a lower and an upper division. The thickness of the coarse breccias diminishes towards the N. while the thickness of the fluviatile deposits increases in the same direction. These M. Damar Beds may be correlated with the Mengger Horizon in the Bumiayu District. The thickness is about 150 m.

4. The Upper Damar Beds. Conformably on top of the Middle Damar Beds follow tuffaceous clays, sandstones and conglomerates, with local intercalations of lahar deposits. The conglomerates have a basaltic composition, while the tuffs are andesitic. These conglomerates are not cemented, or only locally so. The thickness is about 100 m or more.

A fragment of a molar of Elephas namadicus has been found, indicating a correlation with the Gintung Beds of Bumiaju, or middle-upper Pleistocene. (Kabuh Beds of the Kendeng Hills - Solo Plain to the west).

The Upper Damar Beds are unconformably overlain by the Notopuro Beds (Formation).

Type locality: Kali Damar, South of Weleri, Northeast of Central Java.

Geographical distribution: Along the entire N rim of the N Serayu Mnts; the Candi Hills, S of Semarang, in the areas of Bodri, Garang and Penkol, all in Central Java, Semarang area.

Diagnostic fossils: Elephas namadicus (see text).

Reference: Bemmelen (R.W. van) (1949), p. 606.

See: Nanggulan Beds

See: Nanggulan Beds

The letter F is not used in traditional Javanese names. Words containing "F" are usually Arabic or modern western imports.

See: Jiwo Beds

Anonymous (1938). Jaarboek Mijnw. Ned. Indie, p. 18.

The above given reference is from a preliminary summary on the stratigraphy of Bantam, W Java. The data are therefore still: insufficient and no type locality or distribution is indicated.

Disconformably on the Bojongmanik Beds lies a series of 730 m thickness of pumice tuffs and andesitic breccias without fossils but with much silicified wood. It is this series which is called the Genteng Beds.

The beds are overlain by the Cipacar Beds, probably disconformably.

See: Southern Mountains Miocene

See: Candi Layers

See: Southern Mountains Miocene

See: Southern Mountains Miocene

See: Jiwo Layers, Wunkal Layers.