Atlas of the UnderworldThis intriguing title is actually a very serious cataloguing of subducted plates in the Earth's mantle. You can find it HERE. They identify 94 (!) different subducted plates. And that is only those from the last 300 million years! ...

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"Geology in the West Country" - 5 new articles

  1. Atlas of the Underworld
  2. A new look at Old Faithful
  3. * Next week 16th to 23rd October 2017NEX...
  4. Map art
  5. How to run a geothermal field
  6. More Recent Articles

Atlas of the Underworld

Atlas of the Underworld

This intriguing title is actually a very serious cataloguing of subducted plates in the Earth's mantle. You can find it HERE. They identify 94 (!) different subducted plates. And that is only those from the last 300 million years! (After about 250 million years the subducted slab has come to the same temperature as the mantle and therefore cannot be distinguished by seismic tomography.)

There is a vast amount of data on the site and it is well worth looking at.

Google Earth map of the subducted plates. Click on the top right symbol to get the map in a larger form; click on the top left symbol to access even more data.


A new look at Old Faithful

The Plumbing of Old Faithful

This article looks at current work on the geology of the Old Faitful geyser in Yellowstone National Park.

Old Faithful in action
To look at the subsurface they used portable seismometers and the seismic source used was not hitting the ground with a hammer but the hydrothermal features themselves. 

It turns out that Old Faithful's reservoir is much larger than was thought and extends some distance from the geyser and under several buildings in the area including the iconic Old Faithful Inn!


* Next week 16th to 23rd October 2017NEX...

Next week 16th to 23rd October 2017


 11th to 17th September 2017

The following is an extract from Bristol Geology Calendar

More details can be found in the Calendar and on the web sites of the relevant Society or organisation.

All Week (except Monday)

 Bristol City Museum - Pliosaurus!
WhenSun, 13 August, 10:00 – 17:00
WhereBristol Museum & Art Gallery (map)
DescriptionTravel back in time 150 million years and dive into Bristol’s Jurassic seas. We dare you to come face to face with one very special creature – an eight metre long Pliosaurus called Doris. She’s the ultimate predator and you’ll be awestruck as you touch her skin, listen to her heartbeat and smell her disgusting breath! Then travel forward to the present day to find out more about this amazing beast. See her actual fossil – one of the world’s most complete – and play games to discover more about her life and death. All the family can have fun investigating the science that helped us bring her back to life. Ideal for children aged 3-11 years old. Discovered in Westbury, Wiltshire in 1994, our internationally significant specimen is the world’s only example of a new species of pliosaur – Pliosaurus carpenteri – and will be on public display for the first time. Pliosaurs are so big that it took ten years to prepare all the fossils that were found. Bristol Museum & Art Gallery opening times: Tue-Sun: 10am-5pm Closed Mondays except Bank Holiday Mondays and Mondays during Bristol school holidays: 10am-5pm


The annual celebration of Mendip geology is underway. There are far too many individual events to put in the Calendar so here is the flyer which gives lots of information and access to booking details. You can read it here or download and print it out yourself. Click on the next line to download.


Teme Valley Geological Society Lecture - Mountain Building
WhenMon, 16 October, 10:00 – 11:00
WhereMartley Memorial Hall B4197 by Sports Ground (map)
Description Mountain Building, with Paul Gannon Contact Janet 01886 821061 for correct time


Geol Soc Western - Lecture
WhenTue, 17 October, 18:00 – 20:00
WhereThe Hub, Aztec West (map)
DescriptionJames Stockall, Network Rail Managing Victorian Earthwork Assets for Modern Demands "18:00 to 18:30 - networking and refreshments 18:30 to 19:30 - Lecture 19:30 - Questions"

SMFS Evening Meeting
WhenTue, 17 October, 19:30 – 22:00
WhereFriends’ Meeting House, Ordnance Road, Southampton, SO15 2AZ (map)
Description“Heavy Spar” presentation by Gary Morse. Members’ Display Table: Baryte.



Thornbury Geology Group meeting
WhenThu, 19 October, 19:30 – 20:30
Description Thornbury Geology Group, The Chantry, Thornbury, 7.30pm, contact 01454 416882 The group is is an offshoot of Thornbury and District Museum and we welcome new members. Previous geological knowledge can be helpful but is not necessary as members are very willing to share their own knowledge with anyone keen to learn more about Earth Science. The group is loosely following a pre-recorded lecture series which is supplemented by use of other material and geological specimens. On occasions a guest speaker will talk on their specialist topic. Costs are met from attending members' monthly contributions and the group does not have membership subscriptions or a committee





Map art

Geophysical Maps as Art

We all know that maps can be beautiful. This article shows some particularly beautiful ones. All the maps are fascinating. I had a couple of favourites.

This one is particularly good, if not strictly a map.


You can get this video full screen if you access it from this link.

This map takes false colour (actually hyperspectral imaging) to a new level - and its useful!


How to run a geothermal field

Geothermal power - Good but not easy!

This article describes the geology and engineering needed to exploit the geothermal field at Rotorua in New Zealand in a sustainable way. I had no idea of the complications and difficulties involved. It is a long article but well worth reading.


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