Belcher Islands, Hudson Bay, looking south through anticline-syncline pairs. Mostly resistant stromatolitic carbonates and clastic rocks in this view. Nothing like it for field work5yr ⋅ GeologicalTales ⋅ r/geology
Detached and folded turbidite bed - nice example of plastic, brittle and fluidized behaviour of semi-consolidated sandstone-mudstone. About 25 million years old Waitemata Basin. North Auckland, NZ5yr ⋅ GeologicalTales ⋅ r/geology
Fossil Metasequoia cones (Dawn Redwood) from Geodetic Hills, Canadian Arctic. These are about 45 million years old, and yet look quite fresh, plucked from low-rank coals5yr ⋅ GeologicalTales ⋅ r/geology
The meeting of transverse (wind shear) sea waves and standing waves, Manawapou River, west coast NZ5yr ⋅ GeologicalTales ⋅ r/geology
2 billion yr old turbidites with sheeted dewatering pillars. Belcher Islands, Hudson Bay. Overpressured interstitial fluids escaping soon after deposition. Manifested as small mud-sand volcanoes on bedding (shown in next post). The slightly oblique linear marks are glacial scratches, or grooves.5yr ⋅ GeologicalTales ⋅ r/geology
Superposed flood and ebb ripples, subaqueous dunes, rills and small runoff channels on asandbar at the edge of Raglan ebb tidal delta6yr ⋅ GeologicalTales ⋅ r/geology
Gypsum and Halite crusts form a carapace on Atacama salars (salt lakes), here at 4000m. It's what flamingos call home - check out this post https://www.geological-digressions.com/difficulty-breathing-the-atacama-salt-lakes5yr ⋅ GeologicalTales ⋅ r/geology
Field season #2, 1977, Belcher Islands, Hudson Bay. Proterozoic sedimentology and volcanology. Five months here over two seasons. Measured 22,000m in stratigraphic sections.5yr ⋅ GeologicalTales ⋅ r/geology
Shoemaker-Levy 9 comet impacts Jupiter 1994, the only witnessed analogue we have to the disastrous impacts on Earth in geological time. Some of the numbers here are terrifying https://www.geological-digressions.com/witness-to-an-impact Fireball lower left; Io on the right5yr ⋅ GeologicalTales ⋅ r/geology
Bedding view of small mud-sand volcanoes, linked to dewatering pillars (shown in previous post). 2 billion yr old turbidites from Belcher Islands, Hudson Bay.5yr ⋅ GeologicalTales ⋅ r/geology
Terminal moraines and outwash plain at the snout of Strand Glacier, eastern Axel Heiberg Island (Canadian Arctic). This was 1983 - a glacier already in full retreat. Spent 6 weeks up and down the fiord mapping Upper Cretaceous - Eocene clastics5yr ⋅ GeologicalTales ⋅ r/geology
Clints and grykes in Visean limestone (Carboniferous) near New Quay, County Clare, Ireland. Great example of post-glacial karst in the Burrens. No shortage of rock for the patchwork of dry stone walls.5yr ⋅ GeologicalTales ⋅ r/geology
Creme brulee model for a brittle crust-lithosphere and ductile mantle. Edible analogues for the structure of the Earth.6yr ⋅ GeologicalTales ⋅ r/geology
N Scotland & NW Ireland began life on the ancient N American continent (Laurentia) were stitched to the rest of Britain ca. 400 Ma then separated 80 Ma during N Atlantic opening https://www.geological-digressions.com/bits-of-north-america-that-were-left-behind Fig modified from Chew & Strachan 20146yr ⋅ GeologicalTales ⋅ r/geology
Small fan-deltas prograding into Tanquary Fiord, Ellesmere Island. The arrow points to our Geological Survey of Canada camp in 19886yr ⋅ GeologicalTales ⋅ r/geology