In the middle and late 19th century, several renowned Mesoamerican scholars, starting with Charles Etienne Brasseur de Bourbourg, and including Edward Herbert Thompson and Augustus Le Plongeon proposed that Atlantis was somehow related to Mayan and Aztec culture.

The trio was written late in the " middle period " ( spanning roughly 1803 to 1814 ) of Beethoven's compositional career.

The transition from Miacidae to Carnivora was a general trend in the middle and late Eocene, with taxa from both North America and Eurasia involved.

They most likely originated in West Gondwana and are 67 – 107 million years old, so the oldest split could relate to the break-up of Gondwana in the middle Eocene to late Oligocene, 45 – 24 million years ago, and reached their current distribution by multiple intercontinental dispersal events.

In older literature the Cretaceous is sometimes divided into three series: Neocomian ( lower / early ), Gallic ( middle ) and Senonian ( upper / late ).

Marine reptiles included ichthyosaurs in the early and middle of the Cretaceous ( becoming extinct during the late Cretaceous Cenomanian-Turonian anoxic event ), plesiosaurs throughout the entire period, and mosasaurs appearing in the Late Cretaceous.

In the middle to late 1950s, use of the Humble brand spread to other southwestern states, including Arizona, New Mexico, and Oklahoma.

It is most widely accepted that stromatolites from the late Archean and through the middle Proterozoic eon were mostly formed by massive colonies of cyanobacteria ( formerly known as blue-green algae ), and that the oxygen byproduct of their photosynthetic metabolism first resulted in earth ’ s massive banded iron formations and subsequently oxygenated earth ’ s atmosphere.

Meanwhile the five-course baroque guitar, which was documented in Spain from the middle of the 16th century, enjoyed popularity, especially in Spain, Italy and France from the late 16th century to the mid-18th century.

Scholars in the first half of the 20th century came to the conclusion that the Yahwist was produced in the monarchic period, specifically at the court of Solomon, and the Priestly work in the middle of the 5th century BC ( the author was even identified as Ezra ), but more recent thinking is that the Yahwist was written either just before or during the Babylonian exile of the 6th century, and the Priestly final edition was made late in the Exilic period or soon after.

Many linguists believe this to be true of the middle and late stages of Proto-Indo-European.

The Viking Age, a period of migrations of Scandinavian peoples, dominated the period from the late 700s to the middle 1000s.

As a result the Unionists were able to gain most of the votes of the middle classes, who now feared Bolshevik revolution, setting the social and geographical electoral pattern in Scotland that would last until the late 20th century.

After the weakening of the Byzantine Empire and the Bulgarian Empire in the middle and late 13th century, most of the Albanian territory became part of the Serbian state.

The International Red Cross began operations in numerous countries in the late 19th century, promoting nursing as an ideal profession for middle class women.

The oldest known fossil showing unambiguous imprints of hair is the Callovian ( late middle Jurassic ) Castorocauda, an early mammal.

Musical Impressionism is the name given to a movement in European classical music that arose in the late 19th century and continued into the middle of the 20th century.

From their original homelands in Scandinavia and far northern Europe Germanic tribes expanded throughout northern and western Europe in the middle period of classical antiquity, and southern Europe in late antiquity, conquering Celtic and other peoples and forming in 800 the Holy Roman Empire, the first German Empire.

The rule may have been intended as a status symbol for new members of the upper and middle classes in the late 19th and early 20th century.

Balatonfüred and Hévíz developed early as resorts for the wealthy, but it was not until the late 19th century when landowners, with their vines destroyed by lice, began building summer homes to rent out to the burgeoning middle classes.

While a few settlements on Lake Balaton, including Balatonfüred and Hévíz, have long been resort centres for the Hungarian aristocracy, it was only in the late 19th century that the Hungarian middle class began to visit the lake.

The themata were administrative units of the middle and late Byzantine Empire.

Isis was still remembered in the middle ages as a pagan deity, but Mithras was already forgotten in late antiquity.

From the middle and late Eastern Han to the early Wei and Jin dynasties, the net growth of ancient Chinese science and technology experienced a peak ( second only to that of the Northern Song dynasty )... Han studies of the Confucian classics, which for a long time had hindered the socialization of science, were declining.

Early Permian terrestrial faunas were dominated by pelycosaurs and amphibians, the middle Permian by primitive therapsids such as the dinocephalia, and the late Permian by more advanced therapsids such as gorgonopsians and dicynodonts.

Stagnation of deep sea currents in middle Cretaceous times caused anoxic conditions in the sea water.

Pterosaurs were common in the early and middle Cretaceous, but as the Cretaceous proceeded they faced growing competition from the adaptive radiation of birds, and by the end of the period only two highly specialized families remained.

In fact, by the middle Cretaceous, equatorial ocean waters ( perhaps as warm as 20 ° C in the deep ocean ) may have been too warm for sea life, and land areas near the equator may have been deserts despite their proximity to water.

They appeared in the middle Jurassic period, and lasted until the Cretaceous – Paleogene extinction event wiped them out at the end of the Cretaceous.

Eight or so species from only two families made it almost to the end of the Cretaceous, the order having gone through a more or less steady decline since the middle of the period.

All told, 11 families entered the Maastrichtian, a decline from the 19 families known from the Cenomanian in the middle of the Cretaceous.

Janumys is a genus of extinct mammal of the middle Cretaceous.

Geological Map of Great Britain KEY: white = Quaternary ( alluvium ); beige = Palaeogene rocks ; lime green = Cretaceous ; blue / green = Lower Cretaceous ; light blue = middle / upper Jurassic ; mid blue = lower Jurassic ; dark purple = upper Triassic ; light purple = lower Triassic ; light orange = upper Permian ; brick orange = lower Permian ; light blue = Westphalian ( stage ) | upper Carboniferous ( Coal Measures ); mid blue = Namurian | middle Carboniferous ; muddy blue = lower Carboniferous ( limestone ); dull orange & brown = Devonian ; light blue = Silurian ; slate blue = Ordovician ; dark slate blue = Cambrian ; mid orange = Neoproterozoic ( Dalradian ); dark green = Neoproterozoic ( Torridonian ); pink = Lewisian complex | Lewisian ; bright red = granite ; dull red = Palaeogene volcanics

The Fossil Bluff Group, which outcrops within Alexander Island, Antarctic Peninsula, provides a detailed record, which includes paleosols and fossil plants, of middle Cretaceous ( Albian ) terrestrial climates.

The oldest fossil plants come from the middle Cretaceous ( Albian ) Fossil Bluff Group, which outcrop along the edge of Alexander Island.

They lived during the middle Jurassic ( approx 170 mya ) on up through the late Cretaceous ( 65 mya ) and, while armored as the ankylosaurids, did not have a tail club.

Dromaeosaurus () was a genus of theropod dinosaur which lived during the Late Cretaceous period ( middle late Campanian ), sometime between 76. 5 and 74. 8 million years ago, in the western United States and Alberta, Canada.

Kollikodon lived in the lower Cretaceous period, during the middle Albian age ( 100 – 104 million years ago ).

Steropodon galmani was a prehistoric species of monotreme, or egg-laying mammal, that lived during the middle Albian stage, in the Lower Cretaceous period.

The time of impact cannot be accurately constrained, however, it probably happened more recently than 1325 Ma ( middle Mesoproterozoic ), which is the age of igneous rocks that are inferred to have been uplifted by the impact based on aeromagnetic evidence, and significantly older than Cretaceous.

However, this view was questioned by other researchers ; the IPCC First Assessment Report of 1990 discussed the " Medieval Warm Period around 1000 AD ( which may not have been global ) and the Little Ice Age which ended only in the middle to late nineteenth century.

The Estophile Enlightenment Period 1750 – 1840 led to the Estonian national awakening in the middle of the 19th century.

Following the Migrations Period and the fall of the Western Roman Empire, in the middle of the 5th century, Pannonia was ceded to the Huns by Theodosius II, and after the death of Attila successively passed ( entirely or partially ) into the hands of the Ostrogoths ( 456 – 6th century ), Lombards ( 530 – 68 ), and Gepids ( 6th century ).

Johan de Witt and the Republicans did reign supreme for a time at the middle of the 17th century ( the First Stadtholderless Period ) until his overthrow and murder in 1672.

Shichi-Go-San is said to have originated in the Heian Period amongst court nobles who would celebrate the passage of their children into middle childhood.

Later on, these states were replaced by seven large and powerful states during the Warring States Period, and Henan was divided into three states, the Wei to the north, the Chu to the south, and the Han in the middle.

During the middle Ordovician Period ( about 480-440 million years ago ), a change in plate motions set the stage for the first Paleozoic mountain building event ( Taconic orogeny ) in North America.

It traded in local grapes, olives, wheat, livestock and pottery between the middle Bronze Age and the late Hellenic Period ( 1900-100 BC ).

During the Kamakura Period, the Tendai school used its patronage to try to oppose the growth of rival factions — particularly the Nichiren school, which began to grow in power among the merchant middle class, and the Pure Land school, which eventually came to claim the loyalty of many of the poorer classes.

During the middle Triassic Period, ichthyosaurs evolved from as-yet unidentified land reptiles that moved back into the water, in a development parallel to that of the ancestors of modern-day dolphins and whales.

According to the Eastern Han scholar Zheng Xuan, the latest material in the Shijing was the song " Tree-stump Grove " ( 株林 ) in the " Odes of Chen ", dated to the middle of the Spring and Autumn Period ( c. 700 BC ).

In the middle and late part of Spring and Autumn Period, it was in the southern territory of the State of Ba.

In the middle Warring States Period, it was part of the State of Chu.

During the Sengoku Period, in the middle of 16th century, Bungo was a stronghold of the Ōtomo clan.

The site of Isin was occupied at least as early as the Early Dynastic Period in the middle of the 3rd millennium BC, and possibly as far back as the Ubaid period.

* The Middle Period () took place in the middle of the Qing dynasty in the 18th century.

Among the very first dinosaurs to evolve in the middle Triassic Period, about 230 million years ago ( Mya ), they became the dominant herbivores by half way through the late Triassic ( during the Norian stage ).

Subsequently, in the Persian Period, the Samaritans built a temple there probably in the middle of 5th century BCE., arguing that this was the real location of the Israelite temple which had been destroyed by Nebuchadnezzar,

The crater is 6 km in diameter, and fossils found in the rock filling the crater suggest it dates to the middle Ordovician Period, about 455 to 430 million years ago.

* Monoplacophora, a class of molluscs believed to have gone extinct in the middle Devonian Period ( c. 380 million years ago ) until living members were discovered in deep water off Costa Rica in 1952.

The festival saw its peak of grandeur in the middle of the Heian Period, but this waned in the Kamakura Period and the following Muromachi Period, and as the nation entered the Sengoku Period, the festival procession was discontinued.