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Dogtooth spar in a garden wall at Clematis Cottage |
When first walking around Ashford-in-the-Water back in 2018, when visiting Holy Trinity church, I was struck by just how attractive it is and, although I just had a random wander around, it is no surprise that except for some modern housing on its north-west outskirts, the entire village is included within the Conservation Area.
Continuing my British Listed Buildings Photo Challenge, which had so far been restricted to the south-eastern part of the Conservation Area, the next building on my list was the C17 Retreat, a house built with the traditional vernacular building materials of Carboniferous Limestone for walling, with Millstone Grit dressings and a stone slate roof.
I quickly moved on to the Ashford Arms Hotel, which was surprisingly disused at the time and I only took a few photos of this late C18 building from a distance. I could see that the quoins and dressings are painted gritstone, but I didn’t take much notice of the thinly bedded and irregularly coursed masonry that comprises the walling.
Looking at these high resolution photos, however, I can see that the walling is built with limestone that is very muddy and contains a high proportion of chert, which conforms to the description of limestone from the Eyam Limestone Formation in the Conservation Area Appraisal for Bakewell.
In the vicinity of the village, the Building Stones Database for England map explorer shows the mines and quarries that once supplied the very dark and fine grained bituminous limestones from the Monsal Dale Limestone Formation, which was known as Ashford Black Marble – together with the very rare Rosewood Marble – but sources of building stone are not specifically mentioned.
Stopping briefly to photograph the early C19 cast iron milepost, which was erected to serve the Chesterfield to Ashford Turnpike route that was opened in 1812, I headed along Greaves Lane to the next building on my list - the mid C19 Nos. 1 and 2.
The roughly squared and coursed rubble walling shows a variety of types of limestone, with grey micrite and calcarenite being dominant, but blocks of thinly bedded light grey/brown muddy limestone containing beds of chert are quite common.
The gritstone used for the dressings is not of a very good quality and the quoins to the left side have been very deeply weathered and are now set back from the limestone walling. Most of the surrounds to the central ground and first floor windows have been replaced and, looking at the adjoining Old Forge, which dates to the early C19 and is built of similar materials, the door surrounds look like they have also been renewed.
Looking further along Greaves Lane, it is quite obvious that the principal pattern of the vernacular building materials is generally limestone walling, gritstone dressings and stone slate for the roofs but, as seen at the early C19 Candle House, there is considerable variation in the limestone.
The well squared and coursed limestone walling here is a uniformly pale grey colour and, although I just photographed it from the opposite side of the road and didn’t closely examine the stone for crinoids or any other fossils, this looks more typical of the upper light facies of the Monsal Dale Limestone Formation.
The geological map of the area, however, shows that in addition to the Eyam Limestone Formation, it is the dark facies of the Monsal Dale Formation that outcrops in the vicinity of Ashford-in-the-Water, but information about these in the geological memoir and The Building Stones Database for England is extremely limited.
The mid C19 Thornbury, which is listed Grade II Listed for its group value, is built entirely with gritstone ashlar which, together with the dressings to the buildings mentioned above, presumably came from one of the quarries in the Ashover Grit in the vicinity of Bakewell.
Turning onto Hall End Lane, Nos. 1 to 3 provide an another example of thinly bedded pale grey/brown muddy limestone with thin beds of chert, which I again presume to be from a quarry in the Eyam Limestone Formation. Looking closely at the walling, the variable physical and chemical nature of this limestone can clearly be seen.
Retracing my steps back to Greaves Lane, I was particularly interested to see that the owner of the adjoining Clematis Cottage has built a very crude limestone rubble wall in front of the iron railings, which contains three very large lumps of crystalline calcite.
Two of these comprise dogtooth spar, with the calcite being in the scalenohedral crystal form, with the other consisting of calcite in the botryoidal form. Both are examples of speleothems that have formed through mineral precipitation of water-borne calcite and it is quite likely that these were obtained from one of the mines in the area.
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Botryoidal calcite |