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The oldest crust that exists today is about 2.7 billion years old, and remnants have long been known to be in the Canadian Shield.
But older crust, to roughly 4.6 billion years ago when the Earth formed, has remained elusive.
Earth's composition is unlike any other known planet or moon, with rocky crusts forming and moving over the surface.
Over time, this has forced older evidence of such crusts — both oceanic and continental — deep below the surface.
The new class will also use an Approved Equipment List, limiting competitors to racing parts permitted by the CSBK Series.
All competitors will compete with spec Dunlop tires, as do all competitors on the Mopar CSBK tour. Fans of the Mopar CSBK National Superbike Series can expect a close battle for Brooklin Cycle Racing Pro Rookie of the Year overall honors during the final two races of the 2017 season with the Double Header weekend at Canadian Tire Motorsport Park, August 18-20.
Library and Archives Canada (LAC) holds approximately 30 million photographs from various public and private sources in its collection.
Field Day has been an annual event since 1933, and remains the most popular event in ham radio."What Is Field Day" PDF We welcome the public to come learn more about ham radio!
Use our Field Day Locator to search for a Field Day site near you. ARRL has created a Field Day event on Facebook, and you can also join the conversation by using the hash tag #ARRLFD.
Every June, more than 40,000 hams throughout North America set up temporary transmitting stations in public places to demonstrate ham radio's science, skill and service to our communities and our nation.
It combines public service, emergency preparedness, community outreach, and technical skills all in a single event.
Hoping to find evidence of that original crust, Jonathan O'Neil, assistant professor at the University of Ottawa's Department of Earth and Environmental Sciences, and his team of researchers made the trip to a portion of the Shield in northern Quebec to collect samples.