challenge: What types of rocks underlie the territory of the Black Country Geopark?
  
  A. Metamorphic rocks of Jurassic age
  B. Sedimentary rocks of Silurian, Devonian, Carboniferous, Permian and Triassic age
  C. Igneous rocks of Cretaceous age
  D. Foliated rocks of Paleogene age
  Answer: 