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Newsletter: Feb. 2019 Buckinghamshire Geology Group ________________________________________________________________________________ Newsletter No 32 February 2019 ________________________________________________________________________________ ________________________________________________________________________________ Rain in Milton Keynes Standing Stones in Oxfordshire Fossils in Bedfordshire Dinosaurs in Dorset ________________________________________________________________________________ 1 From the Editor Great Linford Geological Walk, th 12 May 2018 Welcome to 2019 and a bumper edition of the newsletter. This is partly to make up for the Having completed the business of the AGM absence of the autumn newsletter and partly to within the MK Arts Centre at Great Linford include accounts of many of last year’s walks (The minutes can be found at the end of this and quarry visits. Also included in this edition newsletter) a party of ten members and guests is the 2019 programme. Some events, later in set off on the geological walk, pausing after the year are still awaiting precise dates. This is two feet of leaving the building to inspect the due in part to quarry owners giving us exterior walls. Originally a 17 th Century barn, permission but not confirming actual dates the construction is of Blisworth Limestone. until nearer the time. Also, some of our out-of- Various shades were in evidence, the colour county trips are being run jointly with other depending on variations in the environment in groups and so, again, we have to wait for final which the stone formed in. Here and there, confirmation of dates. Please check the BGG pinker hues could be made out similar to those website for updates. seen in Olney after last year’s AGM. These were thought to be from limestones from I hope the programme tempts many of you out further north, probably Northamptonshire. to explore our local and regional geology. However, it is also the aim of this newsletter to allow members to discover more about our geology, so, please help us by sending in any questions you may have, photos of mystery geological finds for identification or comments on any geological sites or museum you have visited. We hope to have the next newsletter out in May Mike Palmer Change in Membership Renewal Date St Andrew’s Church, Great Linford Following discussions at the 2018 AGM the Moving on to the neighbouring St Andrews committee have decided to change the Church, more Blisworth Limestone was on renewal date for subscriptions from 1 st January display. Ooliths within some the limestone to 1 st April to fit with the Group’s financial year. around the porch suggested that the stone It was felt that this would also work better with was not of local origin but probably from the Group’s events programme which tends to Northamptonshire (See Newsletter 31, May 2018 thin out over the winter months (although we for more on oolitic limestone) . Some blocks are working on that). clearly preserved the direction of flow within the prehistoric seas in which these limestones This means that anyone who joined or formed 175 million years ago. Modern repairs renewed their membership January 2018 will to the masonry have used younger Portland remain a member up to the end of March Limestone, imported from deepest Dorset. 2019. It also means that anyone who wants to Moving around the church the striking golden, participate in our Spring programme but avoid brown hues of Northamptonshire Ironstone non-member charges can join any time from (from the Northamptonshire Sand Formation) now to March and enjoy membership through added some pleasing colour to the building. to the end of March 2020. Was this purely for aesthetic contrast or is there some structural or other reason for this? Please see the end of this newsletter or visit the website (www.bucksgeology.org.uk ) for membership details. 2 As we were getting to grips with the finer detail of the strata on display a light shower commenced and quickly developed in to a downpour. As a result, we decided not to spend time looking for brachiopods and other fossils in the slabs of the stone circle but instead, move on in the direction of Stonepit Field in the hope that the rain would pass over or at least relent. Our intention at Stonepit (named after the quarry) was to investigate the loose material revealed within an expansive scrape in the middle of the field managed by the MK Parks Trust. Unfortunately, the rain neither passed nor relented and the remaining ‘Stone Circle’, Great Linford party were forced into a valiant but soggy Leaving the church behind we moved on retreat. towards the Grand Union Canal and then westwards to the ‘stone circle’. The circle is made of local Blisworth Limestone. In our August 2017 (No 29) newsletter, Jill described how, during the digging of drains alongside the canal in the 1980s, large blocks of Blisworth Limestone were struck and excavated. As removal from site was costly it was decided to arrange them as a modern stone circle to mark the site of the nearby old quarry now shrouded in woodland. We paused only briefly at the stone circle with the full intention of returning for a closer inspection after visiting the quarry. Rained off at Great Linford Mike Palmer Parks Trust Great Linford Success In July, after our visit to Linford, Jill reported that the Parks Trust had been successful in their National Lottery bid for funding to ‘restore, reveal and revive’ the historic Great Linford Manor Park. In addition to restoring Eighteenth Century features such as the pond, Old Quarry, Great Linford cascades and wilderness garden, money will also be available to make the old limestone Passing through the trees the first glimpse of quarry more accessible for people to learn the quarry was somewhat underwhelming and about the local geological heritage. even closer proximity failed to raise the interest levels or, at least, initially. Jill was So well done to the Milton Keynes Parks Trust. soon able to pick out the detail, showing how And well done to Jill for her work producing a the layers of limestone divided by thin marls geological log and report for Great Linford (lime-rich clays) provided information about the Quarry in support of the bid, as well as cyclicity and time spans of climate change 175 providing advice and guidance to local Parks million years ago. Trust conservation volunteers (see Newsletter No 29). Mike Palmer 3 due to unanticipated erosion between the Exploring the Geology of Bath, Radstock coalfield and Batheaston. 9th July 2018 On a warm and sunny Saturday eight BGG members and friends convened at the foot of Bathford Hill to meet Graham Hickman, our leader for the day. Graham outlined the itinerary, which was to cover the story of William Smith (1769-1839) in the Bath area, where he made some of the ground-breaking discoveries involving of the use of fossils to correlate and map sedimentary formations, which rightly has since accorded him the title Graham demonstrating cross-bedded Great Oolite of “The Father of English Geology”. We were limestone in Farleigh Down Quarry also invited to admire the local but internationally famous Middle Jurassic “Bath Stone” from its outcrop to the finished buildings, now forming the majority of Bath’s Georgian townscapes. Oyster-rich Forest Marble In 1793, early in his career, Smith was appointed as both canal surveyor and engineer to the Somerset Coal Canal Company, whose waterway, joins the Kennett BGG members outside an underground Bath Stone adit. & Avon Canal at the extraordinary Dundas Aqueduct, near Monkton Coombe, which Ascending the hill by a well-worn path, we conveys the canal over the River Avon and came upon “Brown’s Folly” at the crest, within was our second locality. Courtesy of the Angel a 40 hectare biological and geological SSSI Fish Café, it also provided a welcome resting which includes the Farleigh Down Stone place for lunch (Photo). This stretch of the Quarry, now a nature reserve with some Somerset Coal Canal is one of very few underground workings to explore (Photo). sections to have been restored to a navigable state. Middle Jurassic “Great Oolite” stone from here provided the facade for Buckingham Palace. Traces of the uppermost unit here, the “Forest Marble”, were found and its rich and characteristic fossil Oyster content admired. Weathering of the exposed stone has revealed a wealth of sedimentary structure, such as cross-bedding, which Graham explained could be used to determine palaeo-current direction. From the hilltop, the group looked over to north of Batheaston where Smith had supervised the sinking of a coal-exploration borehole, only to Lunch break alongside the restored Somerset Coal be disappointed when it was discovered that Canal the Carboniferous Coal Measures had thinned 4 The convoy then drove to Tucking Mill, where The final stop was in Bath itself, where we a plaque (Photo) has been erected on a small visited Sydney Gardens and could examine cottage to record Smith’s time in residence. some old Bath Stone buildings and Unfortunately, the historians seem to have monuments, before wandering down Pulteney mixed up the story, as we now know Smith in Street, to No. 29, where a plaque fact built and inhabited the neighbouring and commemorates William Smith dictating “ The far more imposing Bath Stone, Tucking Mill Order of the Strata ” in December 1799, many House, between 1798 and 1807. The mill built years before the eventual 1812 publication of by Smith has long since been demolished, but his famous map of England and Wales the mill pond still exists and distracted the Geology. We almost felt transported back to members with its algal bloom that imparted a this time when two passing characters, in weird greenish colour to the water.
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