Note: The term "archaebacteria" is no longer used, just simply, "Archaea." Mr. Andersen from Bozeman describes these ancient organisms in a 7:15 minute YouTube video.
Researchers studying ticks in 25 million-year-old have discovered the ticks were infected with Borrelia, the bacteria that causes Lyme disease. A 2014 article from esciencenews.com