The Evolution of Mud Rock in Earth's History

When plants colonized land it made a huge profound change in what was happening with sediment meaning mud primarily in river bottoms and floodplains the increase in these rocks made out of mud began in the late Ordovician and continuing to the beginning of the Silurian. This does implicate early land plants but it's also interestingly it's earlier than the researchers expected to find it perhaps in part because or perhaps their expectations for finding increases in mud rock in this period were low because the earliest land plants here were they're really puny i think mostly like humans.