Chris White · @Ceedave
150 followers · 271 posts · Server sciencemastodon.com
Above and upon #igneous #dikes
The feature sure looked like a #dike on #satellite view, and a ground check confirmed it. Probably a late #Triassic or early #Jurassic intrusion into #Proterozoic Dedham #Granite, as #Pangea rifted. At Black Rock #Beach, #Hingham, #Massachusetts, #NewEngland #geology USA.
Satellite view from #AppleMaps, #photo by me.
#igneous #dikes #dike #satellite #triassic #jurassic #proterozoic #granite #pangea #beach #hingham #massachusetts #newengland #geology #applemaps #photo
ScienceActually · @scienceactually
51 followers · 176 posts · Server sfba.social
Mount Roraima is composed of Proterozoic age sandstone formed about 2 billion years ago - possibly making it the oldest place on Earth.
#science #sciencefacts #mountroraima #mtrorai #proterozoic #sandstone
A new year of science facts comes with a new design - hope you like it! And thanks to all of you who made these daily tidbits so popular.
#science #sciencefacts #mountroraima #mtrorai #proterozoic #sandstone
Tim Holt-Wilson · @timholtwilson
268 followers · 155 posts · Server mastodon.green
An awesome present from Australia - a lump of Proterozoic banded ironstone from the Marra Mamba Iron Formation (Hamersley region, Pilbara Craton, WA) - 2.4 billion years old.
Layered haematite & chert are evidence of fluctuations in primordial ocean oxygenation. #precambrian #proterozoic #geology
#precambrian #proterozoic #geology
Bill Minarik · @silicatefondue
97 followers · 161 posts · Server fosstodon.org
Katie Maloney spoke about the 950 million year old algae fossils from the Wernecke Mountains, Yukon Territory, Canada. She's reconstructing the biosphere and the spread of eukaryotes at a time before shells or any other hard parts evolved.
#McGillUniversity #EarthSystemScience #FossilFriday #Proterozoic #Yukon
#mcgilluniversity #earthsystemscience #fossilfriday #proterozoic #yukon
Chris White · @Ceedave
87 followers · 87 posts · Server sciencemastodon.com
We walked around #Cohasset, #Massachusetts #USA in the unusually warm (50 F, 10 C) “winter” weather here in #NewEngland. This is an (absurdly) prosperous #coastal community just south of #Boston. The walk included lovely views across coves and marshes (including #invasive Phragmites australis and #peat under #native #Spartina), as well as nice exposures of the > 600 Ma #Dedham #granite, the #pluton coring most of the #Avalon terrane in this area.
#photo #igneous #Proterozoic #geology #saltMarsh
#cohasset #massachusetts #usa #newengland #Coastal #boston #invasive #peat #native #spartina #dedham #granite #Pluton #avalon #photo #igneous #proterozoic #geology #saltmarsh
Max · @MaxTiol
29 followers · 70 posts · Server mastodon.social
Peter L Bowden · @PeterLBowden1
36 followers · 12 posts · Server mastodon.social
One of my favourite #Fridayfold locations in the Åland Islands, between Finland and Sweden.
Flattened pillow lavas buckled by later minor folding.
#Proterozoic #SvecoFennian
#fridayfold #proterozoic #svecofennian