Category: Iotd

The Lake District

We cannot know exactly what this area would have been like when it was full of active volcanoes, but we can get a rough idea from modern subduction regions on Earth today. Under the Mediterranean, for example, the African plate is being subducted underneath the plate carrying Europe.

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Image of the day – 173

A force on Stock Ghyll

This is one of the waterfalls along Stock Ghyll just north-east of Ambleside, Cumbria in the English Lake District. It’s beautiful countryside, and the nearby Force Cafe and Terrace served us a wonderful ‘Full Force’ breakfast. In the local dialect, a waterfall is known as a ‘force’, and there’s a whole string of them along this stretch of Stock Ghyll. A ghyll or gill is a narrow, deep, wooded ravine with a stream running though it. The term can also be used for the stream itself. Donna and I made our way carefully along this muddy, stony footpath, and it was well worth the effort.

Stock Ghyll runs right down into the town of Ambleside where it once powered a series of watermills, and finally flows into the nearby lake of Windermere.

Bobbin mills

Bobbin mills were common in Ambleside in the 19th century. Coppiced timber was cut to length and shaped on a lathe, then wooden discs were attached to both ends and the completed bobbins sold to the textile spinning and weaving businesses in the industrial cities south of the Lake District where they were used to store thread after spinning and before weaving. They contributed to the rapid growth of spinning and weaving factories in northern England. Wooden bobbin manufacturing died out with the 20th century introduction of plastics.

Formation of the Lake District

Skiddaw in the distance

The granite structures of the fells and mountains of the Lake District erupted from volcanoes during the Ordovician period some 460 million years ago.

Much more recently, repeated glaciations ground out U-shaped valleys arranged more or less radially and when the glaciers melted during warmer periods, lakes remained in the valley bottoms. Rivers flowing into the lakes or sometimes from one lake to another, have silted up some of the lakes at one end, and these flat, silted zones are now rich areas of pasture and crop land as well as places where urban construction has become possible. The photo above shows the mountain of Skiddaw in the distance and farmland in the foreground. The town of Keswick, out of the frame to the right, is also built on this flatter land laid down as sediment in the northern part of Derwent Water.

What else can we learn

One thing is very clear, what happens in one time period may be changed drastically at another, later time.

We cannot know exactly what this area would have been like when it was full of active volcanoes, but we can get a rough idea from modern subduction regions on Earth today. Under the Mediterranean, for example, the African plate is being subducted underneath the plate carrying Europe. The Alps and the Pyrenees have risen as a result, and volcanoes like Etna and Vesuvius are still actively pumping out magma or ash. The Mediterranean region is also prone to earthquakes. Now imagine (if you can) a mile or more depth of ice resting on top of the Alps grinding down the rocks to form U-shaped valleys as they slide due to gravity across the rock surface far below.

In Roman times, the areas of river sediment like that in the photo above would have been smaller than they are today and the lakes would have been correspondingly longer.

It’s very much a dynamic process. It’s a bit like the life of a person, we start as a new born infant and learn to talk and walk, then run. We learn to eat, and we learn to reason. at school we learn a lot more about the world we live in, politics, science, other languages, geography, history; we fall in love, we marry and raise a family; we have a career and learn how to manage the work environment, run a business, serve customers, manage bank accounts and so forth. The world is our playground, we travel on business or just for fun, we become grandparents as we grow older and retire from work. There are many beginnings and endings along the rich tapestry that is a human life. And lives intertwine in so many ways – friends, family, work colleagues, neighbours. Just like the Lake District, at any point it’s impossible to know what the future might hold.

Life is the same. What happened in my life when I was young is very different from what is happening in my life today. Change and unpredictabilty are the only things that are consistent throughout. If the ice hadn’t melted when it did, the Lake District would be far different from the place we know and love.

How do we deal with this built-in uncertainty? One way that many have found is faith, following a guide that we trust in ways that stretch us and help to shape our characters. Faith can be like an anchor in a choppy sea or even a full-blown storm, holding us safely in the right place until calmer conditions return. I recommend having an anchor in this experience we call life. But if you choose an anchor, choose carefully, there are some pointers elsewhere on this website. Hunt around and see if there’s anything here that you find attractive or compelling.

I’m always fascinated by links and similarities between one thing and another, life is full of them and sometimes they help to broaden our vision and understanding in ways that are quite unexpected.

See also:

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Living fossils

Living fossils can be found and recognised over long periods of geological time, and appear very similar throughout. And they may have little diversity, in other words the species in the group all tend to be similar to one another.

Leaves of Ginkgo biloba, the Maidenhair tree

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Image of the day – 172

Every now and again biologists discover a plant or animal that looks uncannily like a known fossil. It’s happened a number of times.

Ginkgo leaves Wikimedia

Living fossils have two main characteristics, although some have a third:

  1. Living organisms that are members of a taxon that has remained recognizable in the fossil record over an unusually long time span.
  2. They show little morphological divergence, whether from early members of the lineage, or among extant species.
  3. They tend to have little taxonomic diversity.[5]

The first two are required for recognition as a living fossil; some authors also require the third, others merely note it as a frequent trait.

To put this more simply, Living fossils can be found and recognised over long periods of geological time, and appear very similar throughout. And they may have little diversity, in other words the species in the group all tend to be similar to one another.

Here are some examples, listed in order of their discovery. In some cases the fossil organism was already known before a living form was discovered, in other cases the living form was known first:

  • Dinoflagellates (1753, worldwide in salt and fresh water)
  • Ginkgo or ‘Maidenhair tree’ (1800s or before, southwestern China)
  • Echinothurioida or ‘Soft sea urchins’ (1870s, southern England)
  • Eomeropidae or ‘Scorpion flies’ (1909, southern Chile)
  • Coelacanth there are two living species (discovered in 1938 in the Indian Ocean) and (late 1990s off Indonesia).
  • Metasequioa ( discovered in 1941 in Hunan, China)
  • Glypheoid lobsters (1970s, Philippines)
  • Jurodidae or ‘Jurodid beetles’ (1996, Siberia)
  • Mymarommatidae or ‘false fairy wasps’ (2007ish, North America)
  • Syntexis libocedrii or ‘cedar wood wasp’ (2011, California to British Columbia)

What else can we learn from this

Two things really. The first thing is that species can sometimes exist for very much longer than normal. And the second thing we learn is that species with astonishingly similar appearance may rise independently more than once. So-called fossil species may be no more than independently arising lines that happen to look very similar.We see the same thing between different living groups, so there’s a marsupial mouse that looks quite like its European namesake. This is known as parallel or convergent evolution.

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If you enjoyed this or found it useful, please like, comment, and share below. (If you don’t see those links, click the article’s title above the main photo and they will appear.) Send a link to friends who might enjoy the article or benefit from it – Thanks! My material is free to reuse (see conditions), but a coffee is always welcome and encourages me to write more often!

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Another umbellifer
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Evolution and behaviour

Crystalline inclusions in Cotswold stone

It seems that quartz geodes are not unusual in Oolitic limestone deposits.

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Image of the day – 171

What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every few days.

Click to enlarge

There’s a long stretch of dry stone Cotswold wall along the western edge of the Gloucester Road between Cirencester and Stratton. Walking along the footpath one day I was surprised to see the crystalline inclusions featured in this photo. The crystals look to me like a form of quartz (six-sided columns with six-faced prisms at both ends).

This might be part of a geode fractured open while quarrying the stone. There’s a small chance that the other side of the geode exists elsewhere in the same wall or in some other structure built around the same time. It seems that quartz geodes are not unusual in Oolitic limestone deposits. When they are stained purple purple the crystals are known as amethyst. The formation in the photo shows no hint of colour at all. The deposit must have formed from a particularly pure solution of quartz.

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A grand old house in Cirencester

Mullings engaged the architect William Jay to design the house, and Watermoor House was accordingly built around 1827 in the Greek Revival style

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Image of the day – 170

What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every few days.

Click to enlarge

The land now occupied by Watermoor House and St Michael’s Park may once have been common land. But early large scale Ordnance Survey maps mark a much larger area, including that now occupied by the house and park, as a large nursery. It might have been owned at one time by Richard Gregory who was a Cirencester nurseryman in the 1790s.

The business (and probably the land) passed into the hands of John Jefferies at least by the early 1800s, and it seems that Randolph Mullings, a local solicitor, bought a substantial piece of it in order to build a large house in its own grounds. The details remain unknown, but Gregory, Jefferies and Mullings were known to one another, and Jefferies worked as a manager for Gregory on the nurseries. Gregory lost much of his money by providing surety for a friend’s loan, and Mullings advised Jefferies to continue managing the business and wait to see how things would work out.

Having acquired part of the land, Mullings engaged the architect William Jay to design the building; Watermoor House was constructed to Jay’s plan around 1827 in the Greek Revival style; and the garden and park were added to complete the property. The house is now grade II listed.

At some point Watermoor House became a private school until it closed in the 1950s or 60s. It may have had some other function following this, but today it is a residential care home.

I’ve cobbled this tale together from limited sources that may or may not be reliable. There are also many gaps. It would be good if the story could be properly researched by someone with the time and skills to undertake it.

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Resources for Cirencester history

What do we see here?

The water flows in the town are complex, this section is often known as Gumstool Brook, but it might also be regarded as a diverted part of the Churn.

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Image of the day – 169

What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every few days.

Click to enlarge

At the top of the image you can see the rears of buildings on Cecily Hill in Cirencester. Their gardens contain the trunks and foliage of mature trees just beyond the wall. The wall separates those gardens from the water channel and may have been built specifically for that purpose. Some of the tree branches have grown across the top of the wall.

Near the base of the wall is a distinct line, brown below and much paler above. I think the brown part of the wall is often underwater. The water flow is strongly seasonal, high in wintertime and much, much lower in the summer. The River Churn divides at the Gloucester Road bridge, only a kilometre from this point. The major branch follows the outside of the Roman city wall and usually continues to flow all year round. But the branch in the photo is fed from the outflow of the long, narrow, supply pound for Barton Mill and this in turn is fed from the main flow of the River Churn. The water flows in the town are complex, this section is often known as Gumstool Brook, but it might also be regarded as a diverted part of the Churn.

The pipework at the bottom of this wall was there in the 1950s and 60s when I was a child. Most of it was hidden then by a low wall topped with flagstones, but today much of the structure has fallen away exposing the glazed pipes. Out of the photo a little further to the left, the water disappears underground, running south of Coxwell Street and reappearing at the surface further west in the Abbey Grounds.

It’s good to know that the Town Council and the Friends of Gumstool Brook are looking into ways of improving the flow of this watercourse by adjusting the sluice management rules. We might see the water flowing properly all summer in 2026.

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If you enjoyed this or found it useful, please like, comment, and share below. (If you don’t see those links, click the article’s title above the main photo and they will appear.) Send a link to friends who might enjoy the article or benefit from it – Thanks! My material is free to reuse (see conditions), but a coffee is always welcome and encourages me to write more often!

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Image of the day – 72
Churn flood plain
Churn flooding