Thursday, April 14, 2011

Intertrappean Beds New Site Located
































































































Prof.M.S.Katti and Prof.S.G.More of SP College, Madgaon had visited our department on Bench Marking Programme for three days (12th to 14th April 2011). As a part of this visit, today morning, we visited a DVP & Proterozoic formations (about 0.4 km from Deshnur Cross on Belgaum-Bagalkot road, circled area shown in Google Earth image ), guided by Prof.Katti. This is a new site of Intertrappean beds with shell fragments of lamellibranch, micro-gastropod shell and other unidentified shell fragments. The trap bed is mainly a Grit with rounded-well rounded grains (fluvial/channel deposit). The rock shows cross bedding too. The preliminary report has been communicated to CS.

2 comments:

  1. Sir,
    NE part of Belgaum has mainly Kaladgis (Proterozoic). So in this sedimentary formations we can expect cross bedding, current bedding, ripples etc along with fossils.
    Whereas in NW part of Belgaum we have Deccan Traps. These Traps are maleanocratic (dark), where as sedimentary formations are leucocartic (light), as can be seen in photograph 1 & 2
    Intertrappeans are formed during lull periods of volcanic activity (i,e a area must have previously undergone volcanic activity, then there was a break, during which intertrappeans formed). This means the surrounding area should show volcanic activity. I think the characteristic fossil of interppeans is Cardita beaumonti.

    This what i wanted to share, kindly correct if WRONG!!!

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  2. Thanks for the comment and your interest. Perhaps you know the area from Kardiguddi towards Nesargi, to your left you have all proterozoic and to your right you have basaltic flows. The present area is one junction where contacts have been encountered. Moreover, the proterozoics are non fossiliferous. The fossilization is not complete here. But, there is no restriction of cardita to IT. There are many of them such as gastropods, lamellibranchs. But, I agree more probing is necessary. This is our first glimpse. May be more things come out in our next expedition. Bye.

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