The Fundy Basin is a

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...

-filled

rift basin In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben wi ...

on the

Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe an ...

coast of southeastern

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

. It contains three sub-basins; the Fundy sub-basin, the

Minas Basin , image = Lookout On Way to Cape Split - 25006718579.jpg , alt = , caption = Looking east across the Southern Bight of Minas Basin from The Lookoff , image_bathymetry = , alt_bathymetry = , ca ...

and the

Chignecto Basin The Chignecto Basin is a Structural basin, basin between New Brunswick and Nova Scotia of southeastern Canada. It is a sub-basin of the Fundy Basin.Bay of Fundy The Bay of Fundy (french: Baie de Fundy) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its extremely high tidal range is the hi ...

, which is contained within the rift valley. From the Bay of Fundy, the Minas Basin trends northeast to

Nova Scotia Nova Scotia ( ; ; ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. Nova Scotia is Latin for "New Scotland". Most of the population are native Eng ...

. Chignecto Bay runs from the Bay of Fundy northwest between

New Brunswick New Brunswick (french: Nouveau-Brunswick, , locally ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. It is the only province with both English and ...

and Nova Scotia which is separated from the waters of the

Northumberland Strait The Northumberland Strait (French: ''détroit de Northumberland'') is a strait in the southern part of the Gulf of Saint Lawrence in eastern Canada. The strait is formed by Prince Edward Island and the gulf's eastern, southern, and western sho ...

by the

Isthmus of Chignecto The Isthmus of Chignecto is an isthmus bordering the Maritime provinces of New Brunswick and Nova Scotia that connects the Nova Scotia peninsula with North America. The isthmus separates the waters of Chignecto Bay, a sub-basin of the Bay of ...

. The Fundy Basin is best known for the bay it contains. The

Bay of Fundy The Bay of Fundy (french: Baie de Fundy) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its extremely high tidal range is the hi ...

is home to huge tidal changes and tidal bores. It is part of the system of

Eastern North America Rift Basins The Eastern North America Rift Basins are a series of sediment-filled '' aborted rifts'' created by large-scale continental extension. Their positions closely mirror the eastern coast of North America. Sediments and volcanic material from the rift ...

. Approximately 220 million years ago, during the late

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

period, the

supercontinent In geology, a supercontinent is the assembly of most or all of Earth's continent, continental blocks or cratons to form a single large landmass. However, some geologists use a different definition, "a grouping of formerly dispersed continents", ...

Pangaea Pangaea or Pangea () was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from the earlier continental units of Gondwana, Euramerica and Siberia during the Carboniferous approximately 335 million y ...

began to break apart. The focus of the rifting began somewhere between where present-day eastern

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

and north-western

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

were joined. As the

rift In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-grabe ...

began to separate from mainland North America, volcanic activity occurred, forming

volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

and

flood basalts A flood basalt (or plateau basalt) is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ocean floor with basalt lava. Many flood basalts have been attributed to the onset of a hotspot reach ...

. These flood basalts poured out over the landscape, covering much of southern Nova Scotia. Sections of the flood basalts have been eroded away, but still form a

basaltic Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of a ...

mountain range A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arise ...

known as North Mountain. The rift valley eventually failed (''see''

aulacogen An aulacogen is a failed arm of a triple junction. Aulacogens are a part of plate tectonics where oceanic and continental crust is continuously being created, destroyed, and rearranged on the Earth’s surface. Specifically, aulacogens are a rift ...

) as the

Mid-Atlantic Ridge The Mid-Atlantic Ridge is a mid-ocean ridge (a divergent or constructive plate boundary) located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world. In the North Atlantic, the ridge separates the North Ame ...

continued to separate North America, Europe, and Africa. As in all rifting environments,

graben In geology, a graben () is a depressed block of the crust of a planet or moon, bordered by parallel normal faults. Etymology ''Graben'' is a loan word from German, meaning 'ditch' or 'trench'. The word was first used in the geologic contex ...

s formed. Many of these grabens were created, but for some of them, extension stopped before full rifting occurred. Where only partial rifting occurred,

basins Basin may refer to: Geography and geology * Depression (geology) ** Back-arc basin, a submarine feature associated with island arcs and subduction zones ** Debris basin, designed to prevent damage from debris flow ** Drainage basin (hydrology), a ...

formed. By definition, a basin is any area that collects sediments. These "aborted rifts" (rifts that are

tectonically Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents k ...

inactive and no longer collecting sediments) extend from

Alabama (We dare defend our rights) , anthem = "Alabama (state song), Alabama" , image_map = Alabama in United States.svg , seat = Montgomery, Alabama, Montgomery , LargestCity = Huntsville, Alabama, Huntsville , LargestCounty = Baldwin County, Al ...

Newfoundland Newfoundland and Labrador (; french: Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region ...

. Along certain basins, rifting was not partial. Where full rifting occurred, the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

was created. It is important to note that along these rifts, magmatic activity never stopped, as shown by the ongoing eruption of lava along the

. The Fundy Basin is one in a series of these failed rifts. During its rupture,

tholeiitic basalt The tholeiitic magma series is one of two main magma series in subalkaline igneous rocks, the other being the calc-alkaline series. A magma series is a chemically distinct range of magma compositions that describes the evolution of a mafic magma i ...

lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ...

erupted, producing a sequence of continental tholeiitic basalts. These tholeiitic basalts form a volcanic

known as North Mountain.The Jurassic North Mountain Basalts, Nova Scotia: More Than Just Simple Flood Basalts
Retrieved on 2008-09-24

References

{{Coord, 45, 8, N, 65, 35, W, display=title, region:CA_type:landmark_scale:100000 Volcanism of Nova Scotia Volcanism of New Brunswick Aulacogens Jurassic volcanism Sedimentary basins of North America Mesozoic rifts and grabens Oceanography of Canada

See also

References