📅 Chapter 3

The Timeline

From the end of the last Ice Age to today's political battles — the Oak Ridges Moraine has a 12,000-year story. Here are the moments that shaped it.

🧊Natural History
~12,000 BCE

Glacial Formation

The last ice age retreats, leaving behind the Oak Ridges Moraine.

As the Wisconsin Glaciation retreated northward at the end of the last Ice Age, massive amounts of sediment — sand, gravel, and boulders — were deposited in a complex series of ridges, kettle lakes, and wetlands. The Oak Ridges Moraine was born. Over thousands of years, forests colonized the ridge, wetlands formed in the depressions between hills, and a network of river headwaters emerged. The moraine became one of the most ecologically rich landforms in Eastern North America.

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🌿Natural History
Pre-1800s

Indigenous Stewardship

Indigenous peoples live sustainably on and around the moraine for millennia.

For thousands of years before European colonization, Indigenous peoples — including the Haudenosaunee and Anishinaabe nations — lived in close relationship with the moraine's forests, rivers, and wildlife. They hunted, fished, gathered, and maintained the land through controlled burning and careful stewardship. Their knowledge of the moraine's ecology was (and remains) profound and irreplaceable. The displacement of these communities through colonization severed one of the longest continuous relationships between people and this landscape.

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🚜Natural History
1800s–1950s

Agricultural Era & Early Settlement

European settlers farm the moraine's slopes; forests are cleared but core areas remain.

As European settlers moved into Southern Ontario, much of the moraine's lower slopes and valleys were cleared for agriculture. However, the steeper terrain and poor soil quality of the ridge itself made intensive farming impractical, and large sections of forest remained intact. Towns like Aurora, Newmarket, and Uxbridge grew along the moraine's edges, relying on its springs and rivers for water. The railroad era brought more people and more pressure, but the moraine retained significant ecological integrity through this period.

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🏘️Development Threat
1960s–1980s

Suburban Sprawl Begins

Post-war growth pushes Toronto's suburbs northward toward the moraine.

The postwar baby boom and economic prosperity of the 1950s–70s fueled massive suburban expansion across Southern Ontario. Places like Scarborough, Mississauga, and Markham grew rapidly. By the 1980s, that growth was pushing against the southern edge of the moraine. Development pressure increased significantly — and for the first time, scientists and ecologists began raising serious alarms about what uncontrolled suburban expansion could do to the moraine's water systems and wildlife habitat.

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🔬Conservation Win
1990s

Scientists Sound the Alarm

Researchers document the moraine's ecological significance and call for legal protection.

Through the 1990s, a growing body of scientific research documented just how ecologically important the moraine was — and how threatened it had become. Researchers showed that the moraine's sandy aquifer systems recharged groundwater supplies for an enormous portion of Southern Ontario. Biologists catalogued hundreds of sensitive species using the moraine as a habitat corridor. Conservation groups, scientists, and community advocates began campaigning loudly for the province to act. This decade laid the groundwork for the legislative protection that would follow.

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📜Conservation Win
2001

Oak Ridges Moraine Conservation Act

Ontario passes landmark legislation protecting the moraine for the first time.

After years of public pressure, community organizing, and scientific advocacy, the Ontario government under Premier Mike Harris passed the Oak Ridges Moraine Conservation Act in 2001. This was a landmark moment — for the first time, the moraine was legally defined and much of it received formal protection. The Act divided the moraine into four land-use designations, from "Natural Core" (highly protected) to "Countryside" (limited development allowed). While environmentalists welcomed it, many noted the protections had gaps — particularly along the moraine's edges and in areas already under development pressure.

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🌳Conservation Win
2005

Greenbelt Act Passed

The McGuinty government creates the Greenbelt, adding another layer of protection.

Building on the Oak Ridges Moraine protections, the Dalton McGuinty government passed the Greenbelt Act in 2005, creating a permanent swath of protected land across the GTA's northern and western borders. This included significant overlap with the moraine. The Greenbelt was celebrated as a bold conservation achievement and became internationally recognized as a model for managing urban growth boundaries. At its creation, it covered nearly 1.8 million acres. For a decade, it seemed like the moraine's future was secure.

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🏛️Political Action
2018

Ford Government Elected

Doug Ford's PCs win power on a platform skeptical of urban planning restrictions.

The election of Doug Ford's Progressive Conservative government in 2018 marked a significant shift in Ontario's relationship with land use planning. Ford had criticized the Greenbelt and growth management policies as obstacles to housing affordability. While he initially pledged not to touch the Greenbelt ("not one square inch"), his government immediately began a series of policy changes that critics argued were chipping away at environmental protections — through expanded use of Ministerial Zoning Orders, changes to conservation authority powers, and a general deregulatory approach to development approvals.

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⚠️Development Threat
2022

Greenbelt Removal Announced

The government proposes removing 7,400 hectares from the Greenbelt — including moraine-adjacent land.

In November 2022, the Ford government announced plans to remove approximately 7,400 hectares from the Greenbelt to allow for housing development. The announcement shocked environmentalists and many Ontario residents. Critically, independent analysis showed that the sites selected for removal had not been identified through any open or transparent process — and that many of the parcels were owned by developers who had direct connections to government insiders. Some of the land in question was ecologically sensitive and sat on or near the moraine's recharge zones. Ontario's housing crisis provided political cover, but the process raised serious questions about who was really benefiting.

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🔍Political Action
2023 (Spring)

Auditor General Report

Ontario's Auditor General releases a damning report on the Greenbelt removal process.

In August 2023, Ontario's Auditor General Bonnie Lysyk released a scathing report concluding that the Greenbelt removal process was deeply flawed and appeared to benefit a small group of well-connected landowners. The report found that the Ministry of Municipal Affairs and Housing had worked closely with developers to identify which lands to remove, bypassing normal environmental and planning assessment processes. The report identified significant value gains for landowners whose properties were removed — potentially worth billions of dollars. It was one of the most damning government accountability reports in recent Ontario history.

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✊Public Response
2023 (Fall)

Greenbelt Reversal

Under massive public pressure, Ford reverses the Greenbelt removal.

After months of sustained public protest, media scrutiny, calls for resignation, a damning Auditor General report, and the resignation of multiple cabinet ministers, Premier Doug Ford announced in September 2023 that his government would reverse the Greenbelt removals in their entirety. It was an extraordinary political reversal — and a rare example of sustained public advocacy winning out against powerful development interests. Environmentalists celebrated, but were cautious: the underlying pressures that led to the removal hadn't gone away, and the moraine remained at risk from other development approvals and policy changes.

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🌱Conservation Win
2024–Present

The Fight Continues

The immediate crisis passes, but the battle for the moraine's long-term protection continues.

The reversal of the Greenbelt removals was a victory, but experts warn it shouldn't be mistaken for a permanent solution. The Ford government's aggressive use of Ministerial Zoning Orders continues to face legal challenges. The proposed Highway 413 — which would cut through the Greenbelt and moraine region — remains a live issue. Housing demand continues to put pressure on the urban growth boundary. And climate change is making the moraine's ecological services more important than ever, even as those services are increasingly threatened. The story isn't over. It's just entering its next chapter.

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History told. Now meet the wildlife at stake.

🦌 See Wildlife Impact →