Ar dating little rock
Rare felsic intrusive rocks provide zircon ages of up to ∼3.8 Ga (David et al., 2009; Cates and Mojzsis, 2007) establishing the minimum formation age of the NGB as Eoarchean.
Primary U-rich minerals that may provide reliable formation ages for the dominant mafic lithology, called the Ujaraaluk unit, have yet to be found.
Sm–Nd data for Ujaraaluk whole rocks scatter about a Sm/Nd vs.
Nd correlation (MSWD = 134) whose slope would correspond to 3.6 ± 0.2 Ga if interpreted as an isochron.
The station's studios and transmitter were located in the Times Record/Southwest American building at 920 Rogers Avenue in downtown Fort Smith.
It carried programming from all four networks of the time — NBC, CBS, ABC and Du Mont — but it was a primary NBC affiliate.
Local talent included Clint Fisher, Freddie Rose and programs from Camp Chaffee (later Fort Chaffee).
In 1956, KNAC-TV signed on channel 5 and became a CBS affiliate, from studios in Van Buren.
At that time, CBS was the top network with such hits as Red Skelton, Jackie Gleason and Ed Sullivan's Toast of the Town and later, Your Show of Shows.
However, the networks extended the AT&T coaxial cable to Little Rock in 1957 to provide live coverage of the Little Rock Crisis.
Reynolds then built a microwave transceiver on Mount Magazine to relay live programming from the Little Rock stations.