science

Hemlock Stone

Hemlock Stone is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hemlock Stone rather than just read about it. In short: The Hemlock Stone or Himlack Stone is an inselberg on Stapleford Hill at Stapleford, Nottinghamshire, England. Geology The Hemlock Stone is an outcrop of New Red Sandstone, deposited more than 200 million years ago in the Triassic Period.

Key takeaways

Hemlock Stone belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hemlock Stone to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hemlock Stone from memory before moving on to harder problems.

Reference excerpt

The Hemlock Stone or Himlack Stone is an inselberg on Stapleford Hill at Stapleford, Nottinghamshire, England.

Geology The Hemlock Stone is an outcrop of New Red Sandstone, deposited more than 200 million years ago in the Triassic Period. Approximately 28 feet (8.5 m) high, it is formed of a layer of Nottingham Castle Sandstone overlying a layer of Lenton Sandstone. Both layers are members of the Sherwood Sandstone Group. The Nottingham Castle Sandstone is a medium- to coarse-grained sandstone in which the grains are strongly cemented together by baryte. The Lenton Sandstone is very fine-grained but less well cemented together. As a result, the lower part of the stone is more vulnerable to erosion than the upper part, resulting in differential erosion that has given the inselberg its current "waisted" shape. There are two geological theories as to what removed the surrounding sandstone layers of which the inselberg was once a part. In the 18th century the antiquarian William Stukeley (1687–1765) proposed that it had been left by quarrying of the surrounding stone. Certainly there are signs of past quarrying on and around Stapleford Hill. In 1908 the Ordnance Geological Survey (OGS) propounded that it was the result purely of natural differential erosion, particularly by ice in the Quaternary glaciation. The British Geological Survey, the OGS's modern successor, now supports Stukeley's theory. In October 2015 with the University of Nottingham's Geospatial Institute undertook further study, as part of their "Three Stones Project". Since, in the past, laser mapping had not completely covered the stone, they employed a drone equipped with laser mapping cameras. Black grime coats the Nottingham Castle Sandstone that forms the upper part of the inselberg, but there is none on the Lenton Sandstone below. The deposit is from industrial air pollution before the UK started to restrict air pollution, and illustrates the fact that the upper layer has eroded much more slowly than the lower. Wind erosion is continuing and will eventually destabilise the inselberg. After more than 6,000 years of recorded human habitation in the area, the stone and public are separated by an iron fence, next to which is an explanatory sign.

Cultural responses

Medieval In the Middle Ages it was claimed that the Devil threw the stone there from Castleton, Derbyshire, about 40 miles (64 km) away, because the ringing of church bells annoyed him. Quite apart from the fancifulness of the legend, there is no New Red Sandstone outcrop in that part of Derbyshire from which the stone could have come.

Modern On 3 June 2002 to celebrate the Golden Jubilee of Elizabeth II a large bonfire was lit on the top of Hemlock Stone as part of the worldwide chain of 2,006 beacons lit, watched by a crowd of an estimated 2,000 spectators. The stone is referenced in D.H. Lawrence's novel Sons and Lovers.

Hemlock Happening From the Golden Jubilee celebration developed an annual free festival, the Hemlock Happening, that is held one day each June. It is organised by the communities of Stapleford and Bramcote and held in the Bramcote Walled Gardens near the stone. It usually lasts from 1 pm to 10:45 pm, showing the talents of local schools, groups and individuals and culminating in fireworks set off around the Stone at 10:30 pm. Some scheduled Hemlock Happenings are as follows:

10 June 2006 – attended by about 800 people 9 June 2007 7 June 2008 6 June 2009 – cancelled due to bad weather 12 June 2010 11 June 2011 2 June 2012 – Queen's Diamond Jubilee special 8 June 2013 Participating schools include George Spencer, St Johns Church of England and Bramcote Hills Primary School.

References

Further reading Frost, DV; Smart, JGO (1979). "The Geology of the country north of Derby". Memoir Geological Society GB. Geological Society of London. sheet 125. Gibson, W; Pocock, TI; Wedd, CB; Sherlock, RL (1908). "The geology of the southern part of the Derbyshire and Nottinghamshire Coalfield". Memoir Geological Society GB. Geological Society of London. Morrell, RW (1988). Nottingham's enigmatic Hemlock Stone (3rd ed.). Nottingham: APRA Press. Shipman, J (1891). "The geology of Stapleford and Sandiacre". Transactions. Nottingham Naturalists' Society: 10–19. Stukeley, William (1776). Itinerarium Curiosum. Vol. 1. p. 54. Taylor, FM (1964). "The geology of the area west of Nottingham". Mercian Geologist. 1. East Midlands Geological Society: 73–74.

Links

Illustrations

Worked examples

Example 1 — a first encounter with Hemlock Stone

Start with the simplest possible case. Write down what Hemlock Stone claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hemlock Stone before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hemlock Stone ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hemlock Stone

In research: Hemlock Stone appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hemlock Stone in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hemlock Stone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Landforms of Nottinghamshire, Natural monoliths, Protected areas of Nottinghamshire, so understanding it makes those chapters shorter.
In everyday life: Look for Hemlock Stone outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hemlock Stone in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hemlock Stone means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hemlock Stone out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hemlock Stone in simple terms?

The Hemlock Stone or Himlack Stone is an inselberg on Stapleford Hill at Stapleford, Nottinghamshire, England. Geology The Hemlock Stone is an outcrop of New Red Sandstone, deposited more than 200 million years ago in the Triassic Period.

Why does Hemlock Stone matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hemlock Stone?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hemlock Stone.