When was crowley ridge formed

Crowley's Ridge is a km long topographic ridge that extends from Thebes, Illinois to Helena, Arkansas. The ridge has been interpreted as an erosional remnant formed during Quaternary incision of the ancestral Mississippi and Ohio rivers; however, the Reelfoot Rift COCORP line identified a down-to-the-west fault bounding the western margin of Crowley's Ridge south of Jonesboro, Arkansas.

In each case the faults lie beneath the base of the ridge scarp. The Mini-Sosie data did not resolve the uppermost m and so it was not possible to determine if the faults displace the near-surface Claiborne Group middle Eocene. A shotgun source seismic reflection survey was subsequently conducted to image the uppermost m across the faulted margins.

The shotgun survey across the western margin of the ridge south of Jonesboro reveals displaced reflectors as shallow as 30 m depth. Claiborne Group strata are displaced approximately 6 m and it appears that some of the topographic relief of Crowley's Ridge at this location is due to post middle Eocene fault displacement. Other Online Encyclopedias Other Resources.

Lesson Plans History Day Volunteers Donors. Hubert B. Type Place. Related Media Wittsburg Natural Area. Chalk Bluff Natural Area. Crowley's Ridge. Crowley's Ridge Nature Center. Crowley's Ridge Nature Center Entrance. Natural Divisions Map. Loess Soil.

Francis River. Login to the CALS catalog! Track your borrowing. When the state started accepting lands for public parks, it was only natural that Greene County residents thought Crowley's homesite and spring should be included.

Initial surveys reported that Crowley's land was not adequate to become a park, but several supporters of the project refused to accept defeat. Heading the proponents was Mrs. She launched a letter-writing campaign, used the media to gain widespread public support and enlisted political help from across the state.

Her dream was realized in November , when the Civilian Conservation Corps occupied the property and work started on Arkansas's fourth state park. CCC workers from Companies , and built several miles of roads, foot trails, bridges, cabins, pavilions, a bathhouse, picnic sites, campgrounds and a ft. Gretchen Sacotnik. Huge stones from the nearby former homeplace of Gov.

Futrell were reportedly combined with rock from another area and used with a framework of native cypress logs, trucked in from the St.

According to written accounts from the construction era, a great deal of time and labor went into building the swimming lake, which remains one of the park's main attractions. The CCC crews cleared a natural basin below the springs and brought in more than 11, cubic-yards of dirt for the earthen dam. Workers scooped the lake bottom to a depth of some nine feet, and then clay was brought in to help create a watertight lining for the 3. The new park officially opened in , although people continually visited the park during its construction.

On July 4, , a crowd estimated at 8, picnicked at the park site.