The Geology and the Changing Landscape of Newcastle and the Hunter Valley

By Brooke Sargent (UoN Bachelor of Arts student).

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When I met with Ann Hardy and Gionni  di Gravio from the University of Newcastle’s Cultural Collections to discuss projects for HUMA3003 – Arts Practicum I mentioned my interest in pursuing environmental history once I had completed my studies. Ann and Gionni suggested I undertake a literature review, researching geology of the Newcastle and  Hunter Valley Region to assist with the 3D Virtual Hunter Project:

Through the University of Newcastle’s Cultural Collections and with the help of Charles Martin, the Hunter (Living) Histories is currently undertaking a project to recreate a 3D Virtual Reality model of Newcastle’s landscape from Aboriginal times through to the free settler era. Google Earth technology is being overlaid with historical maps, images and documents.

More information regarding this project can be found below:

3D Virtual Hunter Project

The Coal River Time Machine

The University of Newcastle’s Cultural Collections has developed a thorough list of sources available through their archives, relating to geology of the Newcastle and Hunter Region, together with the J & A Brown-Coal and Allied Archives. As my placement with Cultural Collections was only 80 hours I was not able to survey all of the material available on this subject. As with any research, there is always further study which can be undertaken. Therefore, the following lists may provide a useful starting point for future researchers in this area. These sources also include further notations that I have included after my review. In addition,  details of key sources are provided in a reference list at the end of this article.

Archives Relating to Geology of the Hunter Region

J & A Brown-Coal and Allied Archives

J & A Brown maps and plans

When I began this project, my aim was to ascertain sources to demonstrate Newcastle and the Hunter Valley’s landscape from Aboriginal times through to and beyond the period of free settlement. In surveying a range of sources including both written and visual, the impact of coal mining to the development of Newcastle and the changes it had on Newcastle’s landscape was what came through most clearly . The Hunter Valley Research Foundation (now the Hunter Research Foundation) has in the past conducted research into the Hunter River

System, water resources, sedimentation in the Newcastle Harbour, the use of land for industry, urban land use and the impact of mining. This information would assist in meeting the aims of this project by helping  provide a clearer understanding of how humans have changed the landscape of the Hunter Valley and Newcastle. When the Hunter Valley Research Foundation transitioned to the Hunter Research Foundation its significant archival collection was entrusted to Cultural Collections. However, there is a large body of work which needs accessioning and recording before this archive can be accessed, utilised and used for research purposes. It is recommended that a further project be commissioned to review, accession, catalogue and digitise this extensive resource to make this important research available to the public.

A BRIEF GEOLOGICAL HISTORY OF THE HUNTER VALLEY

According to Beryl Nashar, the Hunter River has repeatedly changed its course. In addition to this, the Hunter River has been dammed to produce Glenbawn Dam, designed for irrigation and flood mitigation purposes.

Hundreds of millions of years ago the area currently known as the Hunter Valley was covered by a large sea (in the form of a gulf), which formed because of the Tasman Geosyncline Subsidence. This gulf became silted up by large amounts of material washing in from surrounding land, leaving a large area of swampland in place of the sea. Generations of vegetation left their decaying remains in these swamps until the entire area was covered by a thick layer of vegetable soil which rested on the bed of marine sediments. When the land subsided again it was covered by sea for the second time. Again, the area silted up and became covered in a further layer of swamp vegetation. Over millions of years the deposits on the top layer were compressed into rock, shale and coal. Other forces caused these layers to become folded into synclines and anticlines. Wind and rain meant some areas became worn down making coal measures accessible.

This information came from the Valley of the Hunter River film, which provides a brief overview on the geological formation of the Hunter Valley.

fig-3-of-page-6-hunter-regional-plan-working-paper-no-11
Geological Setting of the Hunter Region, from the Planning and Environment Commission’s Hunter Regional Plan Working Paper No.11 – Geology, illustrating the different types of rocks within the Hunter Valley, as well as faults, anticlines and synclines.

A BRIEF GEOLOGICAL HISTORY OF NEWCASTLE

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H.T. Plews Plate 2 of Plan 2, 1858, courtesy of University of Newcastle’s Cultural Collections, illustrating the geological layers of Shepherd’s Hill, Government Quarry, Signal Hill and Nobby’s Island.
plate-xxxi-from-a-a-atkinsons-paper-on-working-coal-under-the-hunter-river-from-a6723
Plate XXXI and XXXII from A.A. Atkinson’s Paper: Working Coal Under the Hunter River (from Cultural Collections Archive: A6723).plate.PNG

 

Beryl Nashar describes geology as “the science of the Earth as revealed in rocks.” Furthermore, Beryl believes geology can allow us to better understand our environment.

Shales are abundant around Newcastle and are associated with coal measures.

At one point, Newcastle city, Nobbys and Shepherd’s Hill would have all been islands, with silting of the Hunter River, the emergence of land to around 15 feet and deposits of sediment bringing about the current formation.

A 1963 CSIRO report describes parallel belts of dunes, forested dunes, along with swampy and undulating sand flats towards the east of the mouth of the Hunter River. Also occurring along the mouth of the Hunter River is mangroves with freshwater and brackish swamps.

Nobby’s cliff: Nashar describes this section as approximately 80 – 100 feet tall, made up of layered beds of fine grained chert, which consists of dark grey shales and sandstones. These sediments weather differently, with the softer shales and sandstones becoming worn away. An outcrop of the Nobby’s Coal Seam can be found at sea level, covered by sand. There is a thin coal seam (underlying the Victoria Tunnel Seam) at the top of the cliff. The cliff also contains a 10 foot wide basalt dyke. Rigby and Fryer (cited by Kerr) estimated the original height of Nobbys as around 142 feet.

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Image by William Keene (1854) courtesy of University of Newcastle’s Cultural Collections. This image illustrates Nobby’s original height.
7695863902_799c20a4f8_b
Image originally published by Hunter the Stationer (circa 1920s) courtesy of University of Newcastle’s Cultural Collections. This image illustrates Nobby’s current reduced height.

Signal Hill: Two splits of the Dudley Seam, are separated by 20 feet of dark shales/fossil plants. A basalt dyke has weathered and formed a ditch opposite Signal Hill.

William Keene’s 1854 sketch of Flag Staff Hill (also known as Signal Hill or Fort Scratchley) shows the Dirt Bed Seam, the Government’s Sandstone Quarry and the Australian Agricultural Company’s Working Seam:

4069436269_9c745055fc
William Keene’s 1854 sketch of Flag Staff Hill, courtesy of University of Newcastle’s Cultural Collections.

The below sketch drawn by Strzelecki illustrates the various layers beneath Signal Hill, including conglomerate, coal, clay, sandstone and shale:

page-53-geology-of-the-hunter
Image from David Branagan’s Geology and Coal Mining in the Hunter Valley 1791 – 1861.

A report undertaken around 1902 by A.A. Atkinson, Chief Inspector of Coal Mines for the NSW Department of Mines described Nobbys as:

“a prominent headland at the mouth of the Hunter River…South ward from that point are Signal Hill (120 feet above the high-water mark), and Shepherds hill (250 feet above the high- water mark) with precipitous cliffs, abutting on to the coast-line, decreasing in height towards Merewether.”

This report also states the appearance of an igneous dyke and coal-seams at Nobbys and the cliffs south of Nobbys.

The Bogey Hole: Nashar advises that the upper and lower splits of the Dudley Seam can be seen here, as well as Nobby’s Seam, which is overlain by the Victoria Tunnel Seam.

Merewether: Slightly South of Merewether, the Yard Seam can be seen at sea level, 25-30 feet above sea level is Dudley Seam, while 40 feet is Nobby’s Seam. Above this is the Victoria Tunnel Seam.

Glenrock Lagoon: Is an inlet, whereby a sandbar cuts it off from the sea. However, in heavy storms the bar can be broken forming an outlet to the sea. The water here is a mix of freshwater and seawater.

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Photograph taken by Dr John Turner, courtesy of University of Newcastle’s Cultural Collections

CSIRO describes the area from Newcastle to Redhead as undulating hills on sandstone and shale, terminating in high wave cut cliffs, covered in windblown sand.

Dudley: Nashar states that the Victoria Seam is at sea level here.

newc-coal-measures
Image scanned from the Geological Survey of NSW Department of Mines Geological Survey Report No GS1973/029, February 1973 (Extractive Resources) by R.E. Uren. Image details Newcastle Coal Measures.
page-48-geology-and-coal-mining
Newcastle Coalfield Section, from David F. Branagan’s Geology and Coal Mining in the Hunter Valley.

MINING’S IMPACT ON THE DEVELOPMENT OF NEWCASTLE AND THE HUNTER VALLEY’S LANDSCAPE

The Hunter Valley

The report undertaken by CSIRO in 1963 highlights the significant changes European arrival and subsequent expansion has brought to Newcastle and the Hunter’s landscape. These changes include clearing, grazing and cultivation, which has led to soil erosion. Slumping has also occurred in steep areas such as the Liverpool and Mount Royal ranges after forest clearing. Despite this impact, the report also notes evidence of fires, flood and erosion prior to European arrival, which can be seen in the layers of charcoal ash and fire reddened sand.

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This circa 1841 image of Harpers Hill by John Skinner Prout (courtesy of University of Newcastle’s Cultural Collections) illustrates land clearing and grazing occurring within the Hunter Valley, post European arrival.

Early coal mining in Newcastle

According to documents found in the Coal and Allied Industries archive, the area of Newcastle was officially discovered by Lieutenant John Shortland in 1797. Nashar, citing Britten also notes the discovery of coal at the mouth of the Hunter River by Lieutenant Shortland that same year.

map-early
A sketch of the Hunter River made by John Shortland in 1797. (from Cultural Collections Archive: C2779).

In a course given in 1977 Nashar revealed that until around 1827 Newcastle’s coal measures were mined by convicts for the Sydney market, for local consumption and for export to India. The A.A. Company had the monopoly, which was broken by James Brown’s development of the Tomago coal measures and Four Mile Creek. Completion of the Great Northern Railway line in 1857 further enhanced the export of coal. The discovery of the Greta coal measures at Anvil Creek in 1864, followed by Sir Edgeworth David’s geological studies led to the recognition and mining of the Greta coal measures. By1890 exports from Newcastle (to America and China) reached up to 2,000,000 tonnes per year. Just before World War One the Newcastle Steel Works opened, and this led to further increases in the exploitation of the Newcastle coal measures.

The following two diagrams from Branagan’s Geology and Coal Mining in the Hunter Valley 1791 – 1861 provide further detail regarding Newcastle’s early coalmines and coal industry:

branagan-47

branagan-46

The following two diagrams from A.A. Atkinson’s 1902 Geological Survey of New South Wales – Working coal under the River Hunter, the Pacific Ocean and its tidal waters near Newcastle shows the various colliery properties of Newcastle:

XX plate.PNG
From Cultural Collections Archive: A6723
xxx plate.PNG
From Cultural Collections Archive: A6723

Merewether

In 1835 the first block of land was purchased in what would later become the suburb of Merewether. At this time the hills to the south and south-west of Newcastle City were covered by thick oak and gum trees, the flats were covered by a dense scrub of geebung, five-corner shrubs, ti-tri and a coarse bracken undergrowth. Also, the area between Bar Beach and Merewether Beach was covered by sand at quite a distance from the beach.

The following maps are not dated, however, they provide interesting detail regarding the early development in Merewether and include the Old Burwood Colliery, the Smelting Works as well as various tunnels and railway lines.

merewether-1
Image and above text from Cultural Collections Archive: A6723
merewether-2
From Cultural Collections Archive: A6723

Deepening of the Newcastle Harbour

An article published in the Newcastle Morning Herald and Miners Advocate dated 5 March 1909 discussed the need to deepen the Newcastle Harbour. This need arose due to the large amount of cargo traveling in and out of the harbour, as well as Newcastle’s increasing coal production and distribution.

Capture3.PNG
From Cultural Collections Archive: A7631 iv. This article can also be accessed through Trove.
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This image of Newcastle Harbour was also found in Cultural Collections Archive:A7631, and the full article from the Newcastle Morning Herald and Miners Advocate can also be accessed through Trove.

 

Nobby’s Island

Nobby’s Hadland was originally an island. A 2011 report undertaken by Roslyn Kerr on behalf of the Coal River Working party states:

“Plans, paintings and sketches from the early 1800s depict rocky reefs and sandy shoals lying between the island and the southern shore of the river at Signal Hill (now topped by Fort Scratchley). Surf rolled through this shallow area.”

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This reproduction of Nobbys and early Newcastle (from Cultural Collections Archive:A7614 v) demonstrates how Nobby’s Island would have originally appeared

Breakwater works to improve the entrance to Newcastle Harbour were started in 1835 as the Macquarie Pier. The wall between Nobbys and the mainland was finished in 1848.

The Breakwater connecting Nobbys to the mainland was constructed using Waratah sandstone and quarry rock from Nobby’s Island. Signal Hill was also quarried to assist with the project.

The new breakwater created a sediment trap for sand drifting northwards along the coast. The dominant south-easterly swell produces strong north-flowing long shore currents that transports sediment up the coast. The breakwater interrupts this flow so that sand gradually built up against the breakwater to form Nobby’s Beach.

In 1855 Nobby’s headland was cut to its current height and shape, to allow for a lighthouse to be erected, which occurred in 1857.

BERYL NASHAR’S ORAL HISTORY

Professor Beryl Nashar was born in Maryville, Newcastle in 1923 and went on to become the Foundation Professor of Geology at the University of Newcastle. Nashar was the first Australian to receive a PhD in geology from an Australian University, as well as the first woman Dean of Science at an Australian University.
Denis Rowe’s 1982 interview with Beryl Nashar is available on SoundCloud .

KEY REFERENCES

Branagan, David F. Geology and Coal Mining in the Hunter Valley 1791 – 1861. Newcastle: Newcastle Public Library, 1972.

Commonwealth Scientific and Industrial Research Organization, Australia. General Report on the Lands of the Hunter Valley, 1963.

Kerr, Roslyn. In Search of Nobby’s Tunnels – Report to Coal River Working Party, 2011.

Nashar, Beryl. The Geology of the Hunter Valley. Brisbane: Jacaranda Press, 1964.

Cultural Collections has a great range of images showing the transformation of Newcastle over time. I have reviewed a number of images. Links to some relevant images on Flickr, together with my notes can be found here.


2 thoughts on “The Geology and the Changing Landscape of Newcastle and the Hunter Valley

  1. Interesting and staggering facts about P. E. Strzelecki
    I invite you also to the English version of this mtkosciuszko.org.au website. There related messages are a lot of information about the conquest of Mt Kosciuszko the highest peak of Australia, and about Paul Edmund Strzelecki the explorer who gave the mountain its name.
    Check the text sitemap page to see all the titles

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