I found a diabase sheet forming several kilometers plateau. No overlying rocks are found. It has columnar joints, brecciated base, and numerous bubble-like feature at its top surface (see attached photo). I can not decide if it is a sill or flow.
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Mohamed Saleh Hassan Hammed
if i am right, these features occur at the top of El Mandeisha, El Maysra and El Agoz basaltic sheets at Baharyia depression. it is called tumuli and of good indication on the free subarial eruption of lava flow.
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