Birch Mountains kimberlite field shales interbedded with kimberlite at some of the diatremes are consistent with a Late Cretaceous age (Late Albian to Maastrichtian). The volcanic rocks of the BM field consist primarily of crater-facies pyroclastic kimberlite and resedimented kimberlite. They include massive layers, as well as bedded and graded layers of coarse lapilli alternating with layers of finer tuff. Lapilli and olivine phenocrysts are set in a grey-green matrix of serpentine, carbonate minerals (calcite, dolomite and magnesite) and clay minerals. Phlogopite, oxide minerals (ilmenite, perovskite and spinel), apatite and pyrite are also present. Diamonds and microdiamonds have been recovered from samples taken from
Grammy Award for Best Male Rock Vocal Performance with the award more than any other nationality, though it has been presented to musicians from the United Kingdom four times, from Australia once, and from South Africa once. Each year is linked to the article about the Grammy Awards held that year. Grammy Award for Best Male Rock Vocal Performance The Grammy Award for Best Male Rock Vocal Performance was an award presented at the Grammy Awards, a ceremony that was established in 1958 and originally called the Gramophone Awards, to male recording artists for works (songs or albums) containing quality vocal performances in the rock music genre. Honors