11. The Iberian Peninsula contains rocks of every geological period from the Ediacaran to the Alpine belt. 12. Peppercorn class A1s is named after a geological period and another after an insurance company ". 13. The names of formally defined geological periods and the rock layers corresponding to them are capitalized. 14. ""'Geosternbergia " "'is an extinct pteranodontid reptile from the Late Cretaceous geological period of North America. 15. The first fishes with jaws ( Gnathostomata ) appeared during the next geological period , the Ordovician. 16. It suggested that there are likely to have been at least two geological periods on Venus: 17. Some geologists assert that the Neogene cannot be clearly delineated from the modern geological period , the Quaternary. 18. Palaeontology is the science which deals with the life of past geological periods as known from fossil remains. 19. Formed during the volcanic activity of the Cretaceous geological period , one such west-facing cliff houses the Ellora Caves. 20. There are also three major groups of sedimentary rocks, layers of particles that settled in different geological periods .
