BGSEarthwise

EarthwiseTM aims to disseminate the outputs of BGS research and to promote free exchange of information.Contribute your own articles on related topics . . .

[BGSEarthwise @BGSEarthwise]

This is a ropy flow-structure on the lower, inner surface of a large, flattened vesicle at the top of the Farne Islands Dolerite Sill. It is a part of the Whin Sill-swarm and was emplaced within Carboniferous rocks. @BritGeoSurvey #Igneous #Bamburgh

https://t.co/4hkPcDC0Cu

[The Geology Shop @geologyshop]

JIGSAW PUZZLE NEWS! We now have limited stock of BGS jigsaws available - for those of you who need hours of geological entertainment. Order yours by emailing [email protected]. More information on website: https://t.co/jTARfIYOei #jigsawpuzzles #maps #geology @BritGeoSurvey

[BGSEarthwise @BGSEarthwise]

This is hummocky morainic drift at Glen Torridon, Scotland. It is a fine example of the ‘Ceud Cnoc’ or ‘Thousand Hills’ topography and is probably of Loch Lomond Readvance age. It formed due to the retreat of wasting ice. @BritGeoSurvey #Hummock #Scotland

https://t.co/RQaE3IZ8MX

[BGSEarthwise @BGSEarthwise]

This is a basalt dyke in Lower Old Red Sandstone conglomerate (Great Conglomerate) at Lammermuir Deans, Scotland. The conglomerate adjacent to the dyke has been baked due to the heat of the dyke and very resistant. @BritGeoSurvey #Igneous #Conglomerate

https://t.co/WBEOmSP649

[The Geology Shop @geologyshop]

The 'Dudley locust' is a trilobite with the scientific name Calymene blumenbachii. Did you know it is on the coat of arms for Dudley town? 58% of you got this right! Stay tuned for this week's question on Friday. @BritGeoSurvey #Locust #Trilobite

[BGSEarthwise @BGSEarthwise]

This is some cross-bedded ripples in the Ross Formation Greywacke at Meikle Ross, Kirkcudbright. This cross-bedding formed when a water medium deposited sediment over a ripple which migrated downstream. #Kirkcudbright #Ripple #CrossBedding @BritGeoSurvey

https://t.co/aC3yWlsnbH

[BGSEarthwise @BGSEarthwise]

This exposure at Cammal Burn, Fintry is the basal hawaiite flow of the Lower North Campsie Lavas. It rests on well-bedded ash-fall lapilli tuffs. @BGS_Scotland @BritGeoSurvey #Lava #Basalt #Olivine #Igneous #Extrusive

https://t.co/5CTAWTmdF1

[BGSEarthwise @BGSEarthwise]

Glacial sediments assigned to the Late Devensian Banchory Till Formation are typically sandy, gravelly or bouldery diamictons containing clasts of Dalradian psammite, pelite and semipelite and Caledonian granitic rocks. @BritGeoSurvey #Grampians #Till

https://t.co/Z4T6bPc9Ko

[The Geology Shop @geologyshop]

The weekly quiz is coming to you one day early this week! What is a 'Dudley locust'? ❓❓❓@BritGeoSurvey @BGSEarthwise #Dudley #Locust #Trilobite #Grasshopper #Brachiopod #WestMidlands

[BGSEarthwise @BGSEarthwise]

The Skiddaw Granite Pluton was emplaced during the Early Devonian Acadian Orogeny. The heat from this pluton caused contact metamorphism in the surrounding Skiddaw mudstone, causing a change in it's mineralogy. @BritGeoSurvey #ContactMetamorphism #Pluton

https://t.co/jiplAUe5HL

[British Geological Survey @BritGeoSurvey]

Ever wondered why some rocks have stripes in them?

Learn how sedimentary rocks are formed with our Jam Jar Geologist, @Leannes_space's 'storm in a teacup'! 🌪️

All you'll need is:

🔸 Some gravel
🔸 Some sand
🔸 Water
🔸 A teacup
🔸 A jar
🔸 A helper who can swirl up a storm!

[British Geological Survey @BritGeoSurvey]

If you're looking for something interesting to take part in as you #StayHomeSaveLives why not take up a short geology course?

Michelle from our @NHM_London office returns to recommend her top five short courses from across the internet.

https://t.co/Do56Ep2eCf

[BGSEarthwise @BGSEarthwise]

The Needles in the Isle of Wight are composed of steeply dipping chalk. It is a fine-grained limestone that is made up of coccolithophores; a type of phytoplankton whose skeleton is composed of calcium carbonate. @BritGeoSurvey #Carbonate #Chalk

https://t.co/Cld5LulhTm

[BGSEarthwise @BGSEarthwise]

Can you spot the dipping Torridonian sandstone beds? These are on Mullach Mòr, with Skye Cuillin in the distance. To learn more about the geology of the area, check out the link below! @BGS_Scotland @BritGeoSurvey #Scotland #MullachMor #Sandstone #Dip

https://t.co/s4iw9wAIU5

[BGSEarthwise @BGSEarthwise]

To learn more about Silurian deposits during this time in the UK, check out the links below! ⌛️⏲️⏳ #GeologicalTime #Silurian @BritGeoSurvey

https://t.co/9zuidrI0Fv

https://t.co/pjOtgEeiRT

[The Geology Shop @geologyshop]

The answer is Silurian period! Well done to the 80% that got it right! The Silurian occurred approximately 444 to 416 million years ago. ⏳⏲️⌛️ @BritGeoSurvey #GeologicalTime #Silurian #Time #Chronostratigraphic

PS: how often would you like these quiz questions?

[The Geology Shop @geologyshop]

It's Friday quiz time! What geological period follows the Ordovician? ⌛️⏲️⏳ The answer will be posted Monday so get voting! @BritGeoSurvey #Quiz #GeologicalTime #Silurian #Cambrian #Devonian #Ordovician #Time #Geology #Chronostratigraphy #StratigraphicChart #Stratigraphy #Age

[BGSEarthwise @BGSEarthwise]

This is a photomicrograph of the ultramafic-intermediate complex at the northeast end of the Newry Igneous Complex. @BritGeoSurvey #NorthernIreland #Newry #CountyDown #CountyArmagh #Igneous #XPL #Microscope #ThinSection #Volcano

https://t.co/NuCOCVq6IK

[BGSEarthwise @BGSEarthwise]

Glaciation occurred in Northern Ireland in the Late Midlandian. Its subsequent retreat lead to the formation of deglaciation features like deep lakes. Deltas, like the Murnee Hills were deposited into the lakes and created a high-level shoreline.

https://t.co/VO3ESgdxyj

[BGSEarthwise @BGSEarthwise]

This outcrop is part of the Eigg Lava Formation. Here 20 to 30 cm of red interflow siltstone overlies the reddened, brecciated pahoehoe top of an olivine basalt lava. #Igneous #Pohoehoe #Lava #Basalt #Tuff #Outcrop #Muck #Eigg #Scotland @BritGeoSurvey

https://t.co/Rv4j9aRBE6

[BGSEarthwise @BGSEarthwise]

The Weald consists of largely marine deposits including the Kentish Ragstone. This younger sandstone is lime-rich and is used as a building stone 🏛️ @BritGeoSurvey #Weald #KentishRagstone #BuildingStone #Sandstone #Marine #Lime #Sand #Stone #Outcrop

https://t.co/KYU6quaTeK