At the top of the stone masonry was a row of gradines, such as are often represented in the sculptures as crowning an edifice.

Above the stone masonry the tower was continued at nearly the same width, the casing of stone being simply replaced by one of burnt brick of inferior thickness.

It is supposed that the upper stages were constructed in the same way.

As the actual present height of the ruin is 140 feet, and the upper stages have so entirely crumbled away, it can scarcely be supposed that the original height fell much short of 200 feet.
The most curious of the discoveries made during the examination of this building, was the existence in its interior of a species of chamber or gallery, the true object of which still re-mains wholly unexplained.
This gallery was 100 feet long, 12 feet high, and no more than 6 feet broad.

It was arched or vaulted at top, both the side walls and the vaulting being of sun-dried brick.