Grand Central is the newest shopping complex in central Birmingham, replacing the old Pallasades shopping centre above New Street Station. The floor of this new shopping area is packed full of fossils, all of which are marine. There are two types of limestone here; a beige Jura Limestone from Germany, and a black, bituminous limestone from Spain.
|en echelon tension gashes|
The black limestone, Nero Marquina Marble, has stripes called en echelon gashes. These represent cracks in the rock as it was stretched under tension. The cracks were infilled with hydrothermal fluids which crystallised out. This rock is Cretaceous in age, so between 66 – 140 million years old. The white cliffs of Dover are the same age.
Grand Central will feature in Part Three of the Birmingham Building Stones guide.
|Ammonite with hand for scale|
|Belemnite guard with phragmocone|