41. Glyptochiton became extinct during the Carboniferous period . 42. Five major rock formations present in Colton Point State Park are from the Devonian and Carboniferous periods . 43. Lepidodendrales likely lived in the wettest parts of the coal swamps that existed during the Carboniferous period . 44. The mammalian line of descent diverged from the sauropsid line at the end of the Carboniferous period . 45. Previously, the Oegophiurida were known only to exist from the lower Ordovician to the upper Carboniferous periods . 46. Dragonflies had three-foot wingspans in the Carboniferous period , which was also known as the Age of Cockroaches. 47. The rock is estimated to have formed some 350 million years ago during the early Carboniferous period . 48. These are probably from the Carboniferous period . 49. The rocks are punctuated with abundant natural resources of coal and iron ore from the Carboniferous period . 50. Geologically, the town is situated on rocks of the Carboniferous Period , consisting of coal measures and gritstones.
