64 GRIESBACH : EAMKOLA AND TATAPANI COAL-PIELDS. 



5. Fanchets are at least very probable below the Mabadevas in the neigbbourbood 

 of Garuatand, wbere yellowirb sbaly clays are seen in situ, but tbe relations 

 to tbe surrounding rocks are not clear enougb to sbow tbem on tbe map. 

 4. Maniganj beds with numerous specimens of Schizoneura gondwanensis, Fstm., 

 present in the Jokna nullah, but tbe boundary witb tbe underlying Barakas^ 

 cannot even be guessed at, as tbe nullah does not afford a continuous section. 

 Similarly difficult is tbe adjoining section near Majurdaki, where the trap 

 dyke has altered all tbe rocks, converting tbe whole into burnt brick-like 

 masses. 



3. Barakars, containing Vertehraria indica, Eoyle., Glossopteris indica, Scbmp. 



The shales and sandstones near the trap have been altered into a glass-like slag in 

 some places, and in many ways tbe trap bas disturbed and shattered tbe 

 adjoining rocks. 



2. TalcJiirs. South of Abirapara I found Talcbir sandstones and silts with boulders 

 of tbe usual yellowish-green colour resting on tbe metamorphic series. They 

 form only a thin plastering over tbe older rocks, filling up hollows bere and 

 there, and thinning out and disappearing below the Barakars south-west of 

 Chikni village. 



A great trap dyke cuts through tbe area covered by Talcbirs south of Abirapara 

 and altered the shales in some measure, so that it is not easy to distinguisb 

 tbem from tbe overlying Barakars. 



1. The Metamorpliic series. — Mica scbist witb veins of granite form tbe high 

 ridge south of tbe Maban river, and is a continuation of tbe range of meta- 

 morpbics which stretcbes from near Tatapani in a south-west direction to- 

 wards the Jilmilli field, separating tbe Bisrampur coal-field from my area. 

 South-east of Majurdaki the mica scbist immediately underlying tbe Talcbirs 

 contain numerous hornblendic veins, the whole dipping 55° to the north. 



19^ ) 



