Oxley Beach Geological Heritage – A 500-Million-Year Geological Story 

Oxley Beach and the wider Port Macquarie coastline are part of a geologically significant coastal tract that preserves evidence of ancient oceanic crust, subduction and high-pressure metamorphic processes.

The rocks along the Port Macquarie–Tacking Point coastal tract are not simply ordinary coastal rocks. Geological research has identified rare rocks including blueschist and lawsonite eclogite, providing evidence of ancient plate-tectonic and subduction processes that occurred hundreds of millions of years ago.

The NSW Geological Survey has described the Port Macquarie–Tacking Point coastline as providing excellent exposures of an accretionary subduction complex and associated geological units.

Port Macquarie is also recognised as the first reported Australian locality for lawsonite eclogite and one of only a few such localities worldwide.

This geological heritage forms part of the natural character and scientific significance of the Port Macquarie coastline.

Why These Rocks Matter

At first glance, some of the rocks along the Port Macquarie coastline may appear to be ordinary coastal rocks.

Geological research tells a very different story.

The Port Macquarie–Tacking Point coastal tract contains geological formations that preserve evidence of ancient oceanic environments, tectonic movement, subduction and high-pressure metamorphic processes dating back hundreds of millions of years.

Research has identified rare geological materials including blueschist and lawsonite eclogite, providing an accessible record of processes that normally occur deep beneath the Earth's surface.

This geological heritage forms part of the natural and scientific significance of the Port Macquarie coastline.

Protect Oxley Beach believes these values should be properly understood and considered when decisions are made about the future of Oxley Beach and the proposed Port Macquarie Ocean Pool.

The Port Macquarie Coastal Tract

The Port Macquarie coastline forms part of a geologically significant tract extending towards Tacking Point.

Geological studies have described the Port Macquarie–Tacking Point area as providing important exposures of an accretionary subduction complex and associated geological units.

These rocks preserve evidence of geological processes associated with ancient oceanic crust and the movement of tectonic plates.

The geological record includes formations associated with:

• ancient oceanic crust;

• deep marine sediments;

• volcanic material;

• ocean trenches;

• accretionary processes;

• subduction;

• high-pressure metamorphism; and

• tectonic uplift and exhumation.

Rather than representing a single geological event, the coastline provides evidence of a complex geological journey that unfolded over hundreds of millions of years.

A geological story that can be seen at the surface

One of the remarkable features of the Port Macquarie area is that geological processes that normally occur deep within the Earth are represented by rocks accessible along the coastline.

This makes the area scientifically valuable not only to geologists, but also for education, research and geotourism.

A Geological Journey Spanning Hundreds of Millions of Years

1. Ancient Ocean

The geological story begins in an ancient oceanic environment.

Volcanic activity produced basaltic oceanic crust, while material accumulating on the deep ocean floor eventually formed sedimentary rocks including chert.

2. Movement of the Oceanic Plate

Over geological time, the ancient oceanic plate moved towards a continental margin.

The geological evidence preserved around Port Macquarie records the effects of this changing tectonic environment.

3. Subduction

As oceanic material approached the continental margin, it became involved in an ancient subduction system.

Oceanic crust and sediments were forced downwards beneath the Earth's surface.

4. Deep-Earth Metamorphism

Under intense pressure and relatively low temperatures, some rocks underwent metamorphic changes.

This produced unusual high-pressure rocks including blueschist and eclogite.

5. Return to the Surface

Over immense periods of geological time, tectonic processes brought these rocks back towards the Earth's surface.

Today, parts of this ancient geological journey are exposed along the Port Macquarie coastline. 

Why This Matters at Oxley Beach

Oxley Beach is more than a recreational beach.

It forms part of a broader coastal landscape containing natural, environmental, cultural, recreational and geological values.

The proposed Port Macquarie Ocean Pool is being considered at the northern end of Oxley Beach.

Port Macquarie-Hastings Council resolved in May 2026 to progress the Planning Proposal for the proposed Ocean Pool to the NSW Government for Gateway Determination.

Gateway Determination is a step in the statutory planning process. It is not approval to construct the Ocean Pool.

The geological significance of the wider Port Macquarie coastline therefore forms part of the context in which the future of Oxley Beach should be considered.

Protect Oxley Beach believes the geological and geoheritage values of the area should be properly identified, independently assessed and considered alongside the environmental, cultural, accessibility, coastal hazard, traffic, financial and recreational issues associated with any proposed development. 

What Is Geoheritage?

Geoheritage refers to geological features, sites, landscapes, rocks, minerals, fossils, landforms and geological processes that have recognised scientific, educational, cultural or other heritage value.

Geoheritage can provide:

• scientific research opportunities;

• evidence of Earth's geological history;

• educational opportunities;

• opportunities for geotourism;

• public understanding of natural processes; and

• a physical connection to the geological history of a region.

The geological research undertaken along the Port Macquarie Coastal Tract demonstrates that the area's geological formations have scientific significance.

A key question for the community is therefore:

How should geological heritage be identified, assessed and protected when permanent infrastructure is proposed within a geologically significant coastal landscape? 

What Does the Scientific Research Say?

The geological significance of the Port Macquarie area is supported by published scientific research.

Och & Graham – 2011

David J. Och and Ian T. Graham examined the Rocky Beach blueschist-eclogite outcrop at Port Macquarie and specifically considered its preservation as a geoheritage reserve.

Their work demonstrates that the geological formations of the Port Macquarie area have been the subject of scientific consideration for many years.

Och, Graham & Cole – 2024

In 2024, Och, Graham and Cole published further research concerning the preservation of geological heritage along the unique Port Macquarie Coastal Tract.

The research considered issues surrounding geological heritage, destructive sampling and the ethical responsibilities associated with geological sites of scientific significance.

Geological Survey research

Geological Survey research into the Port Macquarie–Tacking Point tract has documented the geological units and tectonic history represented along this part of the NSW coast.

These studies provide an important scientific foundation for understanding why the geology of Port Macquarie deserves consideration in decisions affecting the coastline. 

Geological Heritage and the Proposed Port Macquarie Ocean Pool

The proposed Port Macquarie Ocean Pool has generated considerable community discussion about the future of Oxley Beach.

The project involves a planning proposal for an ocean pool at the northern end of Oxley Beach.

At the time of publication, the proposal remains within the statutory planning process.

The important question

Protect Oxley Beach is not suggesting that geological significance automatically determines whether development can or cannot proceed.

Rather, the question is whether the geological heritage and geoheritage values of Oxley Beach and the wider coastal area have been properly identified, assessed and considered before decisions are made about permanent infrastructure.

If the proposed Ocean Pool proceeds, construction may involve excavation, drilling, cutting, rock removal and the installation of permanent infrastructure.

The potential effects of these activities on geological exposures, natural coastal features and geoheritage values should therefore be clearly understood and appropriately assessed as part of the planning process.

Our position

Protect Oxley Beach believes decisions affecting Oxley Beach should be based on transparent planning, independent evidence and proper consideration of the area's long-term natural, cultural, environmental, recreational and geological values.

The purpose of this page is to encourage informed consideration of Oxley Beach's geological heritage as part of the broader assessment of the proposed Port Macquarie Ocean Pool.

Government, Scientific & Official Sources

This page draws on publicly available government information and published scientific research.

Port Macquarie-Hastings Council

Oxley Beach Reserve
Official Council information about Oxley Beach, its location, facilities and surrounding area.

Port Macquarie Ocean Pool Planning Proposal
Council information concerning the current statutory planning pathway.

Coastal Management Program
Council's broader coastal management information and supporting technical studies.

Coastal Hazard Assessments
Technical information concerning coastal hazards and future coastal management.

NSW Government

NSW Planning Portal
Planning information relating to the proposed Ocean Pool Planning Proposal.

NSW Geological Survey / Geological Survey of NSW
Geological information and research relating to the Port Macquarie–Tacking Point geological tract.

Academic Research

Published scientific research provides further information about blueschist, eclogite, lawsonite and the geological evolution of the Port Macquarie Coastal Tract.

Readers are encouraged to consult the original sources rather than relying solely on summaries presented on this website. 

Oxley Beach Geological Heritage – News & Updates

This section records relevant developments, scientific research, government information and local reporting relating to the geological, environmental and planning issues affecting Oxley Beach and the Port Macquarie coastline.

2026 – Proposed Ocean Pool Planning Process

Port Macquarie-Hastings Council progressed the Planning Proposal for the proposed Oxley Beach Ocean Pool to the next stage of the NSW statutory planning process.

Why it matters: The planning process provides an opportunity for the geological, environmental, coastal and community values of the site to be properly considered.

2024 – Research into Port Macquarie Geological Heritage

Published research by Och, Graham and Cole examined the preservation of geological heritage along the Port Macquarie Coastal Tract.

Why it matters: The research demonstrates that geological heritage in the Port Macquarie area remains an active scientific and conservation issue.

Earlier Geological Research

Research spanning several decades has documented the unusual geological formations and tectonic history of the Port Macquarie region.

This page will be updated when significant new scientific research, government information or relevant local reporting becomes available.

Frequently Asked Questions

What is the geological significance of Oxley Beach?

• Oxley Beach forms part of the broader Port Macquarie Coastal Tract, an area containing geological formations that preserve evidence of ancient oceanic environments, subduction and high-pressure metamorphism.

Why is Port Macquarie geologically significant?

• Port Macquarie contains unusual geological formations including blueschist and lawsonite eclogite. Geological research has used these rocks to investigate ancient tectonic and subduction processes.

How old are the rocks at Port Macquarie?

• The geological formations record processes dating back hundreds of millions of years, with some rocks associated with geological events occurring approximately 500 million years ago.

What is blueschist?

• Blueschist is a high-pressure, relatively low-temperature metamorphic rock commonly associated with subduction environments.

What is eclogite?

• Eclogite is a high-pressure metamorphic rock that can provide evidence of deep geological processes associated with tectonic plate subduction.

What is lawsonite eclogite?

• Lawsonite eclogite is a rare high-pressure metamorphic rock. Geological research has identified lawsonite eclogite within the Port Macquarie geological complex.

What is geoheritage?

• Geoheritage describes geological sites, formations, landscapes, rocks, minerals, fossils and landforms that have scientific, educational, cultural or other heritage significance.

What is the Port Macquarie Coastal Tract?

• The Port Macquarie Coastal Tract refers to a geologically significant section of coastline extending through the Port Macquarie–Tacking Point area and containing a range of geological formations.

Is the proposed Oxley Beach Ocean Pool approved?

• No. As of the current planning stage, the proposed Ocean Pool is progressing through the statutory planning process. Council's May 2026 decision to progress the Planning Proposal to Gateway Determination does not itself constitute approval to construct the project.

Could construction affect geological heritage?

• Potential impacts would depend on the final design, construction methods and location. If the project proceeds, the effects of excavation, drilling, rock cutting, rock removal and permanent infrastructure on geological exposures should be properly assessed.

Why should geological heritage be considered before development?

• Geological formations can contain irreplaceable scientific and educational information. Once significant geological exposures are destroyed or substantially altered, their original condition and scientific context may not be recoverable.

Who can independently assess geological significance?

• Qualified geologists, geological researchers and appropriate government or academic authorities can assess geological formations and their scientific or geoheritage significance. 

Protect Oxley Beach – Our Position

Protect Oxley Beach believes Oxley Beach should be considered as more than a potential construction site.

The coastline contains interconnected natural, environmental, cultural, recreational and geological values.

We believe those values should be properly identified, independently assessed and considered before irreversible changes are made to the coastline.

Our position is based on the principle that the community should have access to the available evidence and information before forming its own views about the future of Oxley Beach.

We encourage residents, visitors, researchers and the wider community to examine the original sources and make their own informed decisions.

Scientific References & Further Reading

• Och, D.J. & Graham, I.T. (2011)

Preservation of the Rocky Beach blueschist-eclogite outcrop, Port Macquarie, NSW as a geoheritage reserve.

Proceedings of the Linnean Society of New South Wales.

• Och, D.J., Graham, I.T. & Cole, K. (2024)

Preserving geological heritage: addressing destructive sampling and ethical considerations along the unique Port Macquarie Coastal Tract, mid North Coast of NSW, Australia.

Australian Journal of Earth Sciences.

• Geological Survey of NSW

Research concerning the geological units of the Port Macquarie–Tacking Point tract, including its geological and tectonic history.

• Brocx, M. & Semeniuk, V. (2019)

The '8Gs' – a blueprint for Geoheritage, Geoconservation, Geo-education and Geotourism.

Australian Journal of Earth Sciences, 66(6), 803–821.

Government Sources

• Port Macquarie-Hastings Council – Oxley Beach Reserve

• Port Macquarie-Hastings Council – proposed Ocean Pool planning information

• Port Macquarie-Hastings Council – Coastal Management Program

• NSW Planning Portal – proposed Ocean Pool Planning Proposal

• NSW Government geological and coastal information

Sources should be accessed in their original form wherever possible.