Limestone 101 — The Origin Story

How the Chicago Fire Built an Empire 1,000 Miles Away

The true story of Indiana limestone — from ignored rocks under a farmer’s plow to the building stone of American history.

Here’s a story they don’t teach in school. In 1819, workers building the first courthouse in Bloomington, Indiana hauled stone eight miles over dirt roads to the construction site. They dragged it right past rock outcrops lining the entire route. Then they set that stone on top of a deposit of equally good limestone sitting directly beneath the building site.

They were literally standing on it. They just didn’t know what they had.

That stone — Indiana oolitic limestone — would go on to build the Empire State Building, the Pentagon, Yankee Stadium, the National Cathedral, 35 state capitols, and thousands of buildings across the country. It’s been called “The Nation’s Building Stone” for good reason.

But how did a rock that farmers cursed at when it jammed their plows become the most important building material in American history?

It took a fire. A borrowed chisel. And about 300 million years of patience.

• • •

300 Million Years in the Making

Long before Indiana was Indiana, the land sat at the bottom of a shallow tropical sea. Picture the Caribbean — warm, clear water full of tiny marine creatures. As billions of these organisms lived and died, their calcium carbonate shells drifted to the seafloor. Layer after layer, century after century, these shells compressed into rock.

The result is a stone that is 97% pure calcium carbonate — one of the most chemically uniform building stones on Earth. And here’s the detail that makes it special: those ancient shells formed tiny round grains called ooliths (from the Greek word for “egg stone”), giving the rock a texture that’s unusually consistent throughout.

That uniform texture is the whole game. It means the stone cuts cleanly in any direction. It can be sawed, carved, planed, and shaped more easily than granite, marble, or sandstone. A carver can turn it into intricate designs — foliage, faces, Gothic tracery — that would chip or crack in harder stones.

And here’s the kicker: Indiana limestone is relatively soft when it first comes out of the ground. But once it’s exposed to air, it hardens over time. It “seasons.” Buff stone needs 60 to 90 days. Gray stone takes about six months. After seasoning, it gets almost as hard as granite and can last centuries.

A stone that’s easy to work when you need to shape it, then turns rock-hard once it’s in the building. Nature designed the perfect building material. It just needed someone to notice.

• • •

A Borrowed Chisel and a Doctor’s Hunch

The first person to commercially quarry Indiana limestone was Richard Gilbert, who opened a small quarry near Stinesville in 1827. He used the stone for chimneys, monument bases, and bridge piers — local stuff.

A few years later, Dr. Winthrop Foote, a physician in Bedford, had a hunch the stone could be something bigger. In 1832, he brought a stone cutter named Toburn up from Louisville — reportedly the first professional stone cutter in the district. Toburn carved the Foote family burial vault directly from a limestone outcrop. That vault still stands today, nearly 200 years later.

Here’s another proof of durability that would make any mason smile: bridge piers built over Salt Creek near Bedford in 1832 were found to be in excellent condition when they were finally removed in 1917. Eighty-five years of weather, floods, and freeze-thaw cycles, and the stone was still solid.

But despite these early signs, the industry stayed small. Without railroads, you couldn’t ship heavy stone to distant markets. And without distant markets, there wasn’t much reason to invest in bigger quarries.

Then came the railroads. And then came the fire.

• • •

October 1871: Chicago Burns

On October 8, 1871, the Great Chicago Fire destroyed roughly 3.3 square miles of the city. When it was over, the question wasn’t just how to rebuild — it was what to rebuild with.

The answer came from an unexpected direction. After a corruption scandal involving the local Lemont limestone contractor, Chicago officials needed a new stone source for the combined City Hall and County Courthouse. An eastern granite company called Hinsdale-Doyle, based in Maine, had already purchased 30 carloads of stone from a quarryman named Moses Dunn in Bedford, Indiana. The Monon Railroad — which ran right through the limestone belt — had tipped them off.

Hinsdale-Doyle and several other firms organized the Chicago and Bedford Stone Company in 1877. Their bid for the City Hall came in $58,307 cheaper than the lowest bid using Lemont stone.

The Lemont quarrymen fought back. They filed for a legal injunction, arguing that Indiana stone would “blacken excessively” and look terrible next to the existing courthouse. A citizens’ committee investigated — visited Indiana quarries, inspected buildings already using the stone — and the judge denied the injunction, ruling that Indiana limestone was the superior product.

That ruling didn’t just win a contract. It put Indiana limestone on the national map.

These factors produced such a strong pressure upon the ability of existing methods of production to meet the demand that steam-powered channeling, drilling, and hoisting machinery was introduced into the quarries.

— Joseph A. Batchelor, An Economic History of the Indiana Oolitic Limestone Industry, 1944

The Chicago contract created market connections that led to contracts for notable buildings in Chicago, New York, and Newport. Architects loved the contrast between Indiana limestone’s warm buff and gray tones and the dark granites and brownstones that dominated eastern cities. Word spread fast.

By 1893, the U.S. Treasury reported that more than half of all federal building contracts specified Indiana limestone. By 1895, the stone was in use across 25 states, one territory, and the District of Columbia — including more than 200 residences in New York City, 50 in Boston, four state capitols, and dozens of courthouses.

A regional quarry product had become the nation’s building stone in less than 20 years.

• • •

The Boom, the Merger, and the Survivors

The early 1900s were a golden age. Steam-powered machinery gave way to electric channelers and diamond saws. Cut stone mills moved from the cities to the quarry towns in Indiana, where they could shape stone before shipping and save on freight (since you’re not paying to transport the waste). By the 1920s, the district was employing roughly 5,000 workers in quarries and mills.

Then came the great merger.

In 1926, a promoter named Whiting convinced 24 companies — representing 85 to 90 percent of the district’s total capacity — to merge into the Indiana Limestone Company. It was the largest consolidation in the industry’s history.

Not everyone took the bait.

Matthews was solicited, but it didn’t take the bait. We felt we could do better by ourselves. And I believe that was true — the merger has survived until today, but they’ve shrunk to only a fraction of their former proportions and have had a pretty rough time.

— Fred Barrett, President, Matthews Brothers Inc., 1977 interview

Barrett’s instinct was right. Within a year of the merger, 10 of the original owners re-entered the business under new names, using the merger money to buy the newest and best equipment. The merger’s massive debt load collided with the Great Depression, and the company was forced to reorganize.

Matthews Brothers — founded in 1862 by an English stonecutter who came down the Ohio River — survived the Depression, World War II, and the industry shakeout that followed. By 1977, the number of cutstone companies had shrunk from 25-30 down to about seven or eight. Matthews was still standing.

Their secret? Specialization. While other companies chased every contract, Matthews focused on what they did best: ornate church work and institutional buildings. The Washington National Cathedral. The Baltimore Cathedral. Work that required highly skilled draftsmen, stonecutters, and carvers.

My father figured that the really successful cutstone man was the one who knew which job to turn down instead of which one to take.

— Fred Barrett, 1977

• • •

Why This Matters Today

The Indiana limestone industry has survived panics, depressions, world wars, and dramatic shifts in architectural fashion. It has outlasted the brownstone craze, the terra cotta boom, and the rise of precast concrete. Companies have come and gone. The stone endures.

Today, modern CNC cutting technology does in minutes what once took a carver days. Computer-controlled saws and routers achieve precision that the old-timers couldn’t have imagined. But the fundamentals haven’t changed: the stone still comes from the same belt in south-central Indiana. It still hardens with exposure. It still cuts cleaner than any other building stone in the country.

And the arguments Fred Barrett made in 1977 are even stronger now:

The next time you walk past a limestone building — a courthouse, a cathedral, a university hall, a private residence with that warm buff facade — you’re looking at 300 million years of geology, 200 years of American craftsmanship, and a material that was quite literally under everyone’s feet before anyone thought to look down.

The farmers who cursed at it. The workers who hauled stone past stone. They had no idea.

Now you do.