... was a great collision asAfrica drove north into North America and Europe, causingearthquakes and volcanoes, and raising a chain of mountainsfrom the Appalachians, across Ireland and Germany, ... PeriodCenozoicMesozoicPalaeozoicPrecambrianProterozoicArchaeanHadeanTertiaryQuaternaryNeogenePalaeogeneCretaceousJurassicTriassicPermianCarboniferousDevonianSilurianOrdovicianCambrianPennsylvanianMississippian3. Geological timescaleThe ... character of microfossil assemblages changed dramatically: spores appeared.Spores are airborne microscopic cells that are characteristic of land plants. So, although these earliest land plants have...