![]() ![]() The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (scientific branch of geology that aims to determine the age of rocks). The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. Alternate representation of the geologic time scale represented as a clock. ![]() A megannus (Ma) represents one million (10 6) years. The image also shows some notable events in Earth's history and the general evolution of life. ![]() Geologic time scale with proportional representation of eons/eonothems and eras/erathems. The paddle is currently full, but anyone interested is welcome to contact Louisa County Conservation at 31 or email For more information about the Iowa River Water Trail or maps, go to that relates geologic strata to time July 11 and will conclude at about 3 p.m. The Iowa River Geology Paddle departs Sturgis Ferry Park at 9 a.m.“It involves mile-high sheets of ice, unbelievably immense floods - they’d put the ones of recent years to shame - dust and sand building up in sheets and dunes, and periods tens of feet of Eastern Iowa were stripped away by erosion.” “The history of the Iowa River is actually a very dramatic story, and I can get pretty excited talking about it,” Artz said. Water trails help reconnect Iowans to their waterways’ history, heritage, geology, fisheries and wildlife. Water trails are recreational corridors and routes on rivers and lakes that provide a unique experience to all water users, according to the DNR website. We were really excited about the program and are hoping river levels are not a problem again this year.” “We actually had this paddle planned for last season but were flooded out twice before we changed to an indoor, alternative program. “The DNR Water Trails program is providing the funding for the program, Louisa County Conservation is handling the registration, providing the boats, providing staff and lining up the speakers, and Johnson County is providing staff to help the day of the event along with helping with publicity,” Tiller said. “The sediments we’ll be seeing will mostly be very young, geologically speaking.”īrittney Tiller, the naturalist/environmental education coordinator for Louisa County Conservation, said the event is conducted through cooperation with the Iowa Department of Natural Resources Water Trails Program and Johnson County Conservation. “But rocks like sandstones often were laid down by rivers, and to understand how the sandstone formed, and why it looks the way it does, you need to understand how modern rivers work. “When people think of geology, they often think of hard rocks - sandstone, limestone, granite,” he added via email. We’ll be seeing how the Iowa River builds its floodplain - laying down sediment here, eroding it away there, and even putting some in long-term storage for future use.” “Most of what we see will be sediments deposited by the Iowa River. “Actually, there won’t be any rock formations,” Artz said. The entire trail is 72 river miles long and stretches from Sturgis Ferry Access to the mouth of the Mississippi near Oakville. The paddle will follow part of the Iowa River Water Trail, one of 19 official water trails in Iowa. The day will be spent at a leisurely pace, learning about the geology of the river. The trip will depart from Sturgis Ferry Park in Iowa City and end nine river miles downstream at Hills Access. He is an archeologist specializing in how ancient sites, especially those thousands of years old, get buried by floods and wind. “And if they learn something about the history of the Iowa River, going back as much as 300 million years ago, that will be great, too.”Īrtz lives in Iowa City and works for EarthView Environmental Inc. “First, for folks to have a good time canoeing or kayaking on the Iowa River,” he said of his goals. Joe Artz has high hopes for participants in a geology paddle he will guide along the Iowa River on July 11. ![]()
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