hypocentre

 
kasbah meteorites

On a brief parole from grading gaol …

Ian Saginor over at Volcanoclast is hosting this month’s accretionary wedge on the topic of countertop geology. As with many wedges, the geoblogosphere has largely decided to ignore, well at least modify, the brief (probably because we mostly have laminate counter tops). Fortunately, Ian has kindly expanded the topic to include any rocks ‘as long as they’re decorative and completely detached from their origin’.

Unusually for me, my example is a palaeontological offering. This is the centrepiece in the foyer of the wonderfully named Hotel Kasbah Meteorites, in Southern Morocco.

The hotel / kasbah is close to the Berber town of Alnif, famous for it’s trilobite fossils. The hills around Alnif Djbel Issimour are called the trilobites mountains and trilobite sellers line the roads like fruit sellers do in other countries. The hotel owners decided to go with the geology motif with highly fossiliferous bathroom surrounds (edit: see below) and this centrepiece of large ammonites and orthocones.

I have a traditional Berber scarf from the rack in the background that I sometimes wear, much to the befuddlement / amusement of my students in the field.

[update:]

The ammonites and orthocones also appeared as a drinks table in a hotel in Ouarzazate that we stayed in on the last night.

Returns to grading gaol …

 
2012 01 19 Stoke-on-Trent Earthquake

Another Stoke-on-Trent earthquake, magnitude 1.8 occurred yesterday (January 19, 2012) provisionally located near the village of Bagnall, similar to the earthquake on January 11. Above is the recording from Keele University.

If the location of these two events remain this far east, I may have to revise my initial assessment that they are coal mining related since this area is outside the Coal Measures subcrop.

Recent Stoke-on-Trent Earthquakes

View Stoke Quakes in a larger map

 
One of my academic forefathers, Isaac newton.  Source wikimedia.

On a whim today, I decided to trace my academic family tree (i.e. my Ph.D. supervisor being my academic parent; their supervisor, my academic grandparent … and so forth). I was stunned to get back to the early 1600s, before the English Civil War, and with some illustrious scientists in my academic heritage line.

Ian G Stimpson (Cardiff – geophysics)

Robert G Pearce (Newcastle – geophysics)

One of my academic forefathers, Isaac Newton. Source wikimedia.


Ronald W Girdler 1930-2001 (Cambridge – geophysics)

Edward C Bullard 1907-1980 (Cambridge – nuclear physics)

Patrick M S Blackett 1897–1974 (Cambridge – nuclear physics)

Ernest Rutherford 1871–1937 (Cambridge – nuclear physics)

Joseph J Thomson 1856-1940 (Cambridge – nuclear physics)

Edward John Routh 1831–1907 (Cambridge – mathematics)

William Hopkins 1793–1866 (Cambridge – mathematics)

Adam Sedgwick 1785-1873 (Cambridge – geology)

Thomas Jones 1756–1807 (Cambridge – mathematics)

John Cranke 1746-1816 (Cambridge – mathematics)

Thomas Postlethwaite 1731-1798 (Cambridge – mathematics)

Stephen Whisson ?-1783 (Cambridge – mathematics)

Walter Taylor c1700-1743/4 (Cambridge – mathematics)

Robert Smith 1689-1768 (Cambridge – mathematics)

Roger Cotes 1682—1716 (Cambridge – mathematics)

Isaac Newton 1642-1727 (Cambridge – mathematics)

Isaac Barrow 1630–1677 (Cambridge – mathematics)

James Duport 1606-1697 (Cambridge – classics)

Robert Hitch ?-1677 (Cambridge – ?)

… truly standing on the shoulders of giants.

 
2012 01 11 Stoke Earthquake

Yesterday Stoke-on-Trent experienced a minor, magnitude 2.4 tremor that we picked up on our seismometer at Keele.

I think that the official location, near Light Oaks, is a bit too far east as it is almost certainly a former coal mining induced event and the main coal measure sequence is further west. It will be interesting to find out where the felt reports come from.

We haven’t had earthquakes in the north of the city since the Smallthorne sequence of 1988-1990.

It is interesting that we have coal mining induced events of this size and nobody turns a hair, however, if it had been shale gas extraction related, the world would be about to end.

Jan 112012
 
Malvern 2

I have been out the last couple of days undertaking fieldwork for a building stones project, but today I was treated to a glimpse of a gem of a little geological section being prepared. Those of us who work in geoconservation talk a lot about geodiversity but this must be the most geodiverse section I have come across. It is a trench, only about 100m long but displays rocks from the Precambrian, Cambrian, Silurian, Carboniferous and Triassic.

The trench runs across the crest of the ‘Malvern Axis’, a major monoclinal fold trending north-south through central England that brings up Precambrian (~677 Ma; Cryogenian) to the surface. The Malvern line separates the two Precambrian terranes of the Midlands Microcraton, Wrekin Terrane to the west and Charnian Terrane to the east, that forms the solid basement of England. These Precambrian igneous rocks are unconformably overlain by Middle Cambrian Malvern Quartzite, and then Upper Silurian (Pridoli) Raglan Mudstone, and Upper Carboniferous (Moscovian) Halesowen Fm. This sequence was folded and thrust during the Variscan Orogeny at the end of the Carboniferous into the north-south Malvern Axis. Extension during the Triassic produced normal faulting along the Malvern Line and deposition of Middle Triassic (Anisian) Bromsgrove Sandstone to the east in the Worcester Graben. All this is being exposed in just one 100m trench, albeit somewhat tectonically shortened.

Standing on the axis, this is the view to the east. In the trench, the light coloured material in the foreground is Precambrian Malvern Complex, succeeded by grey/green and grey Carboniferous, red Silurian muds and Triassic sands towards the car.

To the west, the white is Cambrian followed by Carboniferous and Silurian on the other side of the axis. Note that many of the lithological identifications are still tentative.

The section is still in the process of being created and is on private land, but should be stunning when finished.

© 2012 Hypo-theses Suffusion theme by Sayontan Sinha