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Pouerua
Pouerua is a 270 m high basaltic scoria cone, in the Kaikohe-Bay of Islands volcanic field in New Zealand. It is in the locality of Pakaraka and was the site of a pā that was studied during a major archeological project in the 1980s. Pouerua is registered with the Historic Places Trust as a traditional site (Registration Number 6711). The last Māori who occupied Pouerua were the Ngāti Rāhiri subtribe of Ngāpuhi Ngāpuhi (or Ngā Puhi) is a Māori iwi associated with the Northland region of New Zealand and centred in the Hokianga, the Bay of Islands, and Whangārei. According to the 2018 New Zealand census, the estimated population of Ngāpuhi is 16 .... They left in about 1860. According to the Historic Places Trust, Pouerua is considered the origin and the watershed or pou of the two tribal areas of Ngapuhi, at the Hokianga in the west and Taumarere in the east. References The Archaeology of Pouerua (Auckland University Press) [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pakaraka
Pakaraka is a settlement in Northland, New Zealand, at the junction of State Highway 1 and 10, in the district the Ngāpuhi tribe called Tai-a-mai. Demographics Pakaraka statistical area covers and had an estimated population of as of with a population density of people per km2. Pakaraka had a population of 666 at the 2018 New Zealand census, an increase of 111 people (20.0%) since the 2013 census, and an increase of 159 people (31.4%) since the 2006 census. There were 222 households, comprising 333 males and 333 females, giving a sex ratio of 1.0 males per female. The median age was 40.7 years (compared with 37.4 years nationally), with 147 people (22.1%) aged under 15 years, 96 (14.4%) aged 15 to 29, 333 (50.0%) aged 30 to 64, and 93 (14.0%) aged 65 or older. Ethnicities were 80.2% European/Pākehā, 34.2% Māori, 0.9% Pacific peoples, and 1.4% other ethnicities. People may identify with more than one ethnicity. The percentage of people born overseas was 14.0, com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaikohe-Bay Of Islands Volcanic Field
The recently active basaltic Kaikohe-Bay of Islands volcanic field in the Northland Region of New Zealand is associated geographically with an older region of extinct volcanism to its north the Wairakau Volcanic Centre, meaning eruptions in this region have occurred over the last 20 million years. All the cones older than 2 million years have eroded away, leaving plateaus from Ōkaihau to Kerikeri and north to Whangaroa from the old andesite/dacite stratovolcanoes of the Wairakau Volcanic Centre and the ten million year old or more recent volcanoes in field towards the south. In the southern part of the field, around 12 small basaltic scoria cones, and a rhyolite dome erupted in the last 500,000 years around Kaikohe. The field is considered dormant, rather than extinct. Tectonics The field is part of the eastern Northland volcanic belt which extends south to the Whangārei volcanic field near Whangarei and the south east volcanics of the Taurikura volcanic complex as found i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ngāpuhi
Ngāpuhi (or Ngā Puhi) is a Māori iwi associated with the Northland region of New Zealand and centred in the Hokianga, the Bay of Islands, and Whangārei. According to the 2018 New Zealand census, the estimated population of Ngāpuhi is 165,201. This compares to 125,601 in 2001, 102,981 in 2006, and 122,214 in 2013. It is formed from 150 hapū/subtribes, with 55 marae. Despite such diversity, the people of Ngāpuhi maintain their shared history and self-identity. Te Rūnanga ā Iwi o Ngāpuhi, based in Kaikohe, administers the iwi. The Rūnanga acts on behalf of the iwi in consultations with the New Zealand Government. It also ensures the equitable distribution of benefits from the 1992 fisheries settlement with the Government, and undertakes resource-management and education initiatives. History Foundations The founding ancestor of Ngāpuhi is Rāhiri, the son of Tauramoko and Te Hauangiangi. Tauramoko was a descendant of Kupe, from ''Matawhaorua'', and Nukutawhiti, of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek grc, label=none, πλεῖστος, pleīstos, most and grc, label=none, καινός, kainós (latinized as ), 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by the Isthmus of Panama, causing a faunal interchange between the two reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pa (Māori)
Pa, pa, PA, P.A. or pA may refer to: Businesses and organisations Government and military * Palestinian National Authority, also called Palestinian Authority, interim governing body of the Gaza Strip and part of the West Bank * Pakistan Army * People's Association (Singapore), a Singaporean grassroots statutory board * Philippine Army * Patrulla Águila * Planning Authority, a government agency of Malta Airlines * Pan American World Airways, IATA airline designator PA (to 1991) * Florida Coastal Airlines, IATA airline designator PA (1995–2010) * Airblue, IATA airline designator PA (from 2003) Other * Progressive Alliance, a political international of social-democratic, socialist and progressive political parties and organisations * Professional association, a type of business organization * PA Consulting Group * PA Media, a news agency in the UK and Ireland, formerly the Press Association * Produttori Associati, an Italian record label Linguistics * Pa (cuneiform), a cun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island country by area, covering . New Zealand is about east of Australia across the Tasman Sea and south of the islands of New Caledonia, Fiji, and Tonga. The country's varied topography and sharp mountain peaks, including the Southern Alps, owe much to tectonic uplift and volcanic eruptions. New Zealand's capital city is Wellington, and its most populous city is Auckland. The islands of New Zealand were the last large habitable land to be settled by humans. Between about 1280 and 1350, Polynesians began to settle in the islands and then developed a distinctive Māori culture. In 1642, the Dutch explorer Abel Tasman became the first European to sight and record New Zealand. In 1840, representatives of the United Kingdom and Māori chiefs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scoria Cone
Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock that was ejected from a volcano as a molten blob and cooled in the air to form discrete grains or clasts.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. It is typically dark in color (generally dark brown, black or purplish-red), and basaltic or andesitic in composition. Scoria is relatively low in density as a result of its numerous macroscopic ellipsoidal vesicles, but in contrast to pumice, all scoria has a specific gravity greater than 1, and sinks in water. The holes or vesicles form when gases that were dissolved in the magma come out of solution as it erupts, creating bubbles in the molten rock, some of which are frozen in place as the rock cools and solidifies. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta ( lapilli, blocks and bombs), for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
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 all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of Venus, which cover ~80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intrusive Rock
Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form '' intrusions'', such as batholiths, dikes, sills, laccoliths, and volcanic necks.Intrusive RocksIntrusive rocks accessdate: March 27, 2017.Igneous intrusive rocks, accessdate: March 27, 2017.Britannica.comintrusive rock , geology , Britannica.com accessdate: March 27, 2017. Intrusion is one of the two ways igneous rock can form. The other is extrusion, such as a volcanic eruption or similar event. An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an ''extrusion'' consists of extrusive rock, formed above the surface of the crust. Some geologists use the term plutonic rock synonymously with intrusive rock, but other geologists subdivide intrusive rock, by crystal size, into coarse-grained plutonic rock (typically formed deeper in the Earth's crust in batholiths or stocks) an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tarahi (volcano)
Tarahi is a high andesite volcano, in the Kaikohe-Bay of Islands volcanic field in New Zealand. Northwest of Tarahi is a smaller, basaltic scoria cone, Haruru pā, before the higher cone of Te Ahuahu. To its immediate east is Putahi and the location of a famous battle of the Flagstaff War adjacent to Lake Ōmāpere Lake Ōmāpere is the largest lake in the Northland Region of New Zealand. It is located to the North of Kaikohe. The lake sits within the Kaikohe-Bay of Islands volcanic field. The lake was formed when an ancient lava flow blocked a valley, form .... References Geological Society of New Zealand Volcanoes of the Northland Region Far North District {{Northland-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ignimbrite
Ignimbrite is a type of volcanic rock, consisting of hardened tuff. Ignimbrites form from the deposits of pyroclastic flows, which are a hot suspension of particles and gases flowing rapidly from a volcano, driven by being denser than the surrounding atmosphere. New Zealand geologist Patrick Marshall (1869-1950) coined the term ''ignimbrite'' from the Latin ''igni-'' ireand ''imbri-'' ain Ignimbrites are made of a very poorly sorted mixture of volcanic ash (or tuff when lithified) and pumice lapilli, commonly with scattered lithic fragments. The ash is composed of glass shards and crystal fragments. Ignimbrites may be loose and unconsolidated, or lithified (solidified) rock called lapilli-tuff. Near the volcanic source, ignimbrites often contain thick accumulations of lithic blocks, and distally, many show meter-thick accumulations of rounded cobbles of pumice. Ignimbrites may be white, grey, pink, beige, brown, or black depending on their composition and density. Many pale i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
