basal conglomerate

basal conglomerate

[′bā·səl kən′gläm·ə·rət]
(geology)
A coarse gravelly sandstone or conglomerate forming the lowest member of a series of related strata which lie unconformably on older rocks; records the encroachment of the seabeach on dry land.
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Ali (1962) suggested a thickness of ~500 m for the combined basal conglomerate quartz mica schist and quartzite members measured at Pind Khan Khel.
The mandible was at the contact of the lower marl carbonate and the basal conglomerate. An estimated age is 27,000 years before present based on stratigraphic position at the basal conglomerate-lower marl contact (Fig.
The 2010 exploration programs are underway and are aimed at further testing and significantly expanding the current resources, as well drilling a large iron-rich basal conglomerate for the first time.
For example, in areas underlain by the Meguma Supergroup, basal conglomerate of the Horton Group is composed primarily of quartz-pebble conglomerate derived from quartz veins that are ubiquitous in metasedimentary strata, whereas in areas flanked by granitic basement the basal conglomerate is typically arkosic granite-pebble conglomerate.
In the old Rio Algom drill logs, there was only a suggestion of this new Basal Conglomerate Bed and the potentially higher grades, but nothing close to the type of grades they're now seeing, said Shefsky.
The quartz conglomerate unit deserves further study since it resembles the Chequilla Conglomerate, or even the basal conglomerate of Provence and Sardinia.
Shefsky is very bullish about the their high-grade findings in a basal conglomerate bed 15 metres below a main conglomerate bed (sedimentary rock of pebbles solidified into solid rock).
Most probably, early diagenetic conditions were similar to the lithification stage of the basal conglomerate pebbles of the Upper Cambrian Kallavere Formation in the Pakri Peninsula (Nemliher & Puura 1996a).
###Miocene###Rawalpindi###Muree Formation###Massive sandstone beds dark red and purplish clay/shale with basal conglomerates.