The Monoliths, also known as Agassiz Rock, is a park in

Manchester-by-the-Sea, Massachusetts Manchester-by-the-Sea (also known simply as Manchester, its name prior to 1990) is a coastal town on Cape Ann, in Essex County, Massachusetts, United States. The town is known for scenic beaches and vista points. According to the 2020 populati ...

, owned and maintained by

The Trustees of Reservations ''The'' is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The ...

. The park's name is from two examples of large

glacial erratic A glacial erratic is a glacially deposited rock (geology), rock differing from the type of country rock (geology), rock native to the area in which it rests. Erratics, which take their name from the Latin word ' ("to wander"), are carried by gla ...

boulder In geology, a boulder (or rarely bowlder) is a rock fragment with size greater than in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. In ...

s plucked from

bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bed ...

. As glaciers scoured this landscape, the mass of bedrock forming the hill proved more resistant than the surrounding soil, forcing the bottom of the glacier up and over the hill. The north side was smoothed and the south side left steep and rugged as the glacier broke off chunks of

rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wale ...

as it passed. Little Rock is a

granite Granite ( ) is a coarse-grained (phanerite, phaneritic) intrusive rock, intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly coo ...

monolith A monolith is a geological feature consisting of a single massive stone or rock, such as some mountains. Erosion usually exposes the geological formations, which are often made of very hard and solid igneous or metamorphic rock. Some monolit ...

on one of the trails. It rests on a small jagged

stone In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its Chemical compound, chemical composition, and the way in which it is formed. Rocks ...

, leaving an opening below. A short distance away, other boulders lie perched on the edge of this glaciated upland. Below, in a small

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

swamp A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...

, rests thirty-foot-tall Big Rock. Its depth is unknown. The trail to the site is a one-mile loop that passes both Big and Little rocks. Following long periods of

rain Rain is a form of precipitation where water drop (liquid), droplets that have condensation, condensed from Water vapor#In Earth's atmosphere, atmospheric water vapor fall under gravity. Rain is a major component of the water cycle and is res ...

the area surrounding Big Rock often floods.

History

In 1874, a group of students named this site to honor

Louis Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he recei ...

, the

Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...

professor who first theorized that the rocks that dot

New England New England is a region consisting of six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York (state), New York to the west and by the ...

's landscape were shaped and deposited by glaciers. Agassiz visited the site and found the erratic physical features fit his hypothesis. Prior to Agassiz's hypothesis, it was widely believed that the scattering of rocks throughout New England were the result of

Noah Noah (; , also Noach) appears as the last of the Antediluvian Patriarchs (Bible), patriarchs in the traditions of Abrahamic religions. His story appears in the Hebrew Bible (Book of Genesis, chapters 5–9), the Quran and Baháʼí literature, ...

's flood. The rock is often used as a type example of a

. The first parcel on the site was donated in 1957. There were subsequent gifts and purchases in 1958, 1960, 1961, 1963, 1964, 1966, 1967 and 2001. In 2020, The Trustees of Reservations announced plans to change the name of the property, citing what a news report called "increasing public discomfort with the legacy of the property’s namesake". In 2022, the rename was complete.

References

{{coord, 42, 35, 46.81, N, 70, 46, 2.75, W, type:landmark, display=title The Trustees of Reservations Open space reserves of Massachusetts Parks in Essex County, Massachusetts Manchester-by-the-Sea, Massachusetts Protected areas established in 1957 1957 establishments in Massachusetts