31. It is from the Pennsylvanian epoch of the Carboniferous period , approximately 300 million years ago. 32. Juvenile insects are also known from the Carboniferous Period . 33. After the end of the Carboniferous period , an intrusion of quartz dolerite formed the Whin Sill. 34. The first fossil record for abiotic pollination is from fern-like plants in the late Carboniferous period . 35. The dendroid graptolites survived until the Carboniferous period . 36. Swamps formed across the state as the Carboniferous period continued and the sea left the state. 37. Towards the close of Carboniferous Period some 295 million years ago ( Ma ), country rock. 38. They are made up of metamorphic rocks dating from the Lower Cambrian to the Carboniferous period . 39. From the late Neoproterozoic Era to Carboniferous Period , Europe underwent the Caledonian Orogeny and Variscan Orogeny. 40. They were components of the understories of coal swamps of the Carboniferous Period ( around ).
