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#proterozoic — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #proterozoic, aggregated by home.social.

  1. Volyn biota (Ecosystems 🏞️)

    The Volyn biota are fossilized microorganisms found in rock samples from miarolitic cavities of igneous rocks collected in Zhytomyr Oblast, Ukraine. It is within the historical region of Volyn, hence the name of the find. Exceptionally well-preserved, they were dated to 1.5 Ga, within the "Boring Billion" period of the Proterozoic geological eon.

    en.wikipedia.org/wiki/Volyn_bi

    #VolynBiota #Volhynia #Ecosystems #Lithophiles #Proterozoic #ZhytomyrOblast

  2. #Mafic enclave (?) in Rattlesnake Hill #Granite, #Massachusetts

    This Devonian granite intrudes #Proterozoic Dedham Granite south of #Boston. It is younger than the nearby Blue Hill Granite Porphyry. The triangular area is rich in large crystals, possibly hornblende. The blue crystals at lower left may be #riebeckite, another amphibole. Riebeckite gives Quincy Granite and the #BlueHills Range their distinctive color. All on Avalon terrane, out of Gondwana. Acadian Orogeny was Devonian. My #photo

  3. #Mafic enclave (?) in Rattlesnake Hill #Granite, #Massachusetts

    This Devonian granite intrudes #Proterozoic Dedham Granite south of #Boston. It is younger than the nearby Blue Hill Granite Porphyry. The triangular area is rich in large crystals, possibly hornblende. The blue crystals at lower left may be #riebeckite, another amphibole. Riebeckite gives Quincy Granite and the #BlueHills Range their distinctive color. All on Avalon terrane, out of Gondwana. Acadian Orogeny was Devonian. My #photo