During the Cretaceous, the late-Paleozoic-to-early-Mesozoic supercontinent of Pangaea completed its tectonic breakup into present day continents, although their positions were substantially different at the time.

During the Cretaceous period, the rift between South America and Africa would be forming ; this may explain the contrast in diversity between the two continents.

During the Jurassic and Cretaceous, the remaining nonmammalian cynodonts were small, such as Tritylodon.

During the late Cretaceous era, monitor lizards or their close relatives are believed to have evolved into amphibious and then fully marine forms, the mosasaurs, which reached lengths of up to 17 m.

During the Late Cretaceous, cheilostomes diversified rapidly to reach a level of more than 20 families in the Maastrichtian.

During part of the Jurassic, rising seas flooded the low-lying areas of the continent, forming the Sundance Sea ; in the Cretaceous, much of the Interior Plains region lay submerged beneath the Western Interior Seaway.

During the Cretaceous period, the central area of the United States was covered by a shallow sea, which disappeared as the land rose.

During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident.

During the early Cretaceous, Wealden Lake covered the majority of what is now northern Europe.

During the Cretaceous, Earth on average was warmer than it is now, making the polar regions more habitable.

During the early part of the Late Cretaceous all groups of sauropods, with the exception of the titanosaurs, had gone extinct.

During the Cretaceous, South America pulled away from the rest of Gondwana.

During the Cretaceous the site ( red boxes ) was within the Antarctic Circle

During the Early Cretaceous the location was a flood plain within a great rift valley that formed as Australia started to separate northward from Antarctica.

During the Cretaceous ( labeled K on the graph ), sea level was so high that a seaway extended across the center of North America from Texas to the Arctic Ocean.

During the later portion of the Cretaceous, from, average global temperatures reached their highest level during the last ~ 200 million years.

During the Cretaceous, flowering plants were " geographically limited on the landscape ", and so it is likely that this dinosaur fed on the predominant plants of the era: ferns, cycads and conifers.

During part of the late Cretaceous period, the region had been submerged under a shallow sea, the Western Interior Seaway, and preserves extensive marine deposits.

During the Jurassic, as Pangea began to rift apart, large grabens formed in central India filling with Upper Jurassic and Lower Cretaceous sandstones and conglomerates.

During the evacuation, a glacier which contains two sea reptiles from the Mesozoic era, Cretaceous and Maelstrom, breaks off.

During its flowering in the sixth to the eighth centuries, Mahayana offered a supernatural package to the Chinese which bears no resemblance to the highly digested philosophical Zen morsels offered to the modern Western reader.

During the Quaternary period, mammals, flowering plants, and insects dominated the land.

During his lengthy reign, Rus ' reached the zenith of its cultural flowering and military power.

During this span of time Marsala lived a wealthy period, but the burying of the big harbour of Punta Alga, decided by the emperor Carlo V to stop Saracenis forays, entailed the end of its flowering.

During flowering the leaves have already started to wither.

During the spring season, hill slopes around Tengboche are covered with flowering rhododendrons.

During the era of relative religious tolerance that followed, writers such as the Jewish theologian Maimonides ( 1135 – 1204 ) or the Muslim polymath ( 1126 – 1198 ) Averroes penned works of theology, science, philosophy, and mathematics that would have lasting impacts on Hebrew and Muslim philosophy and prove essential to the flowering of the European Renaissance centuries later.

During the early spring, opium poppies can be seen flowering in gardens throughout North America and Europe, and beautiful displays are found in many private planters, as well as in public botanical and museum gardens ( e. g. United States Botanical Garden, Missouri Botanical Garden, North Carolina Botanical Garden, residential garden, Seattle, WA, and residential garden, Hartford, CT ).

During flowering, pollen from the anthers can fall onto the stigma.

During the development of the embryo sac inside a flowering plant ovule, the three cells at the chalazal end become the antipodal cells.

During this age, Spain pursued military conquests in parts of Europe and conquered large parts of the Americas, which brought great riches to the country and inspired a flowering of the arts.

During the reign of Charlemagne, King of the Franks from 768 – 814 AD, whose empire united most of Western Europe for the first time since the Romans, there was a flowering of literature, art, and architecture known as the Carolingian Renaissance.

During the time shortly after a fire, chaparral communities may contain soft-leaved herbaceuous annual plants that dominate the community for the first few years-until the burl resprouts and seedlings of chaparral perennials create an overstory, blocking the sunlight from other plants in the community.

During the second year of the plant's life, a long, leafy stem from 50 to 255 centimeters tall grows atop the roots of healthy plants.

During the 16th century, Ashante society experienced sudden changes, including population growth because of cultivation of New World plants such as cassava and maize and an increase in the gold trade between the coast and the north.

During some or all of the 20th century, the Laurales generally included Amborella and the plants now classified in Austrobaileyales and Chloranthaceae.

During the winter months, manatees often congregate near the warm water outflows of power plants along the coast of Florida instead of migrating south as they once did, causing some conservations to worry they have become too reliant on these artificially-warmed areas.

During this long trip he collected many plants and animals.

During the Manhattan Project enriched uranium was given the codename oralloy, a shortened version of Oak Ridge alloy, after the location of the plants where the uranium was enriched.

During this period the number of Chardonnay plants increased fivefold and by 1990 it was the most widely planted white wine grape in Australia and third most planted overall behind Shiraz and Cabernet Sauvignon.

During the ensuing 75 million years, plants evolved a range of more complex organs-from roots to seeds.

During the late Archaic and Woodland Period, Indians in the region began to cultivate plants such as marsh elder, lambsquarters, pigweed, sunflowers and some native squash.

During the eighteenth century, the figure of the priest, mathematician and botanist José Celestino Mutis ( 1732 – 1808 ), was delegated by the Viceroy Antonio Caballero y Gongora to conduct an inventory of the nature of the Nueva Granada, which became known as the Botanical Expedition, which classified plants, wildlife and founded the first astronomical observatory in the city of Santa Fé de Bogotá.

During the late 1960s, Arkin began cultivating plants and trees in his backyard, eventually developing a kind of carambola, or star fruit, that became commercially viable and was named after him.

During that time, Alströmer received several plants from Linnaeus himself, and Dahl was able to review the Linnean collection, which is now included in the collections of the Swedish Museum of Natural History in Stockholm.

During the Nineteenth dynasty Hapi is often depicted as a pair of figures, each holding and tying together the long stem of two plants representing Upper and Lower Egypt, symbolically binding the two halves of the country around a hieroglyph meaning " union ".

During that time, California issued licenses to 38 new power plants, amounting to 14, 365 megawatts of electricity production when completed.

During a survey in the Bhagwan Mahaveer Sanctuary and Mollem National Park, 32 species of plants were identified as food for gaur.

During the DPF era, the company invested heavily in its plants and also acquired Silver Loaf Baking Company, Eddy Bakeries, and Mrs. Cubbison's Foods, Inc.

During the fifties, the economy was still driven by Todd Shipyards, Maxwell House, Lipton Tea, Hostess and Bethlehem Steel and companies with big plants still not inclined to invest in huge infrastructure elsewhere.

During Spanish rule in the 17th century, this area of New Mexico was named the " Llano Estacado " or " staked plains ", a possible reference to the prominent and imposing yucca plants that dot the flat horizon of the Southwestern High Plains.

During the 19th century the area closest to Ljungby itself consisted mostly of sand without any vegetation, and the government released funds to plant trees which would tie together the sand and make it suitable for plants.

During the turn of the century 1900s wood chemical plants dotted McKean County and pumped money into the local economy.

During the 1970s, many new industries moved to the area and the city began a period of growth with such companies as Better Built Aluminum, Cumberland Swan, and Square D building plants in the town.

During World War II, several aircraft plants were operated in the area, and the Kraft Foods company purchased a vacant one after the war for its own use.