Now the more #riebeckite facies of the #Paleozoic #Quincy #Granite
The Quincy granite was a prized architectural stone, most famously used in the #BunkerHill Monument in #Boston #Massachusetts. Current dating suggests it was intruded into #Avalonia before it glommed onto #Laurentia as #Laurasia and #Pangea were assembled. Today’s #photo set comes from a walk around the eponymous Bunker Hill Quarry. I’ll post more about the history later. Captions!
#Fujifilm #XH1 #igneous #intrusive #NewEngland
#riebeckite #Paleozoic #quincy #granite #bunkerhill #boston #massachusetts #avalonia #laurentia #laurasia #pangea #photo #fujifilm #xh1 #igneous #intrusive #newengland
Now the more #riebeckite facies of the #Paleozoic #Quincy #Granite
The Quincy granite was a prized architectural stone, most famously used in the #Bunker#Hill Monument in #Boston #Massachusetts. Current dating suggests it was intruded into #Avalonia before it glommed onto #Laurentia as #Laurasia and #Pangea were assembled. Today’s #photo set comes from a walk around the eponymous Bunker Hill Quarry. I’ll post more about the history later. Captions!
#Fujifilm #XH1 #igneous #intrusive #NewEngland
#riebeckite #Paleozoic #quincy #granite #bunker #boston #massachusetts #avalonia #laurentia #laurasia #pangea #photo #fujifilm #xh1 #igneous #intrusive #newengland
Quincy or #BlueHills #Porphyry #Granite
An alkaline, nonorogenic granite intruded into #Avalonia in the #Silurian / #Ordovician as it cruised from peri-#Gondwana to #Laurentia, before assembling #Pangea in the #Acadian #Orogeny (#Devonian). It’s coarse, with the #phenocrysts of amphiboles(?) (possibly riebeckite?)…I’m no petrologist. From@the Eaton’s Pond conservation area@at the #Braintree #Quincy border. My photos.
#geology #igneous #Massachusetts #Boston #NewEngland #Fujifilm #photo
#bluehills #porphyry #granite #avalonia #silurian #Ordovician #gondwana #laurentia #pangea #acadian #orogeny #devonian #phenocrysts #braintree #quincy #geology #igneous #massachusetts #boston #newengland #fujifilm #photo