age of cycads
- That period of Earth’s history dominated by cycads; the Jurassic period. age structure. Number or percentage of individuals in each age class of a population.
Expanded glossary of Cycad terms . 2014.
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Karoo Ice Age — The Karoo Ice Age from 300–400 Ma (million years ago) was the second major period of glaciation of the Phanerozoic Eon. It is named after the glacial tills found in the Karoo region of South Africa where evidence for this ice age was first… … Wikipedia
gymnosperm — gymnospermism, n. /jim neuh sperrm /, n. Bot. a vascular plant having seeds that are not enclosed in an ovary; a conifer or cycad. Cf. angiosperm. [1820 30; < NL gymnospermae name of type. See GYMNO , SPERM] * * * Any woody plant that reproduces… … Universalium
Jurassic Period — Interval of geologic time, 206–144 million years ago, that is one of the three major divisions of the Mesozoic Era, preceded by the Triassic Period and followed by the Cretaceous. During the Jurassic, Pangea began to break up into the present day … Universalium
Cycadeoidophyta — ▪ gymnosperm division also called Bennettitophyta an extinct division of plants with certain features in common with cycads (division Pinophyta) and grouped with them and the seed ferns (division Pteridospermophyta). Both the cycadeoids… … Universalium
Mesozoic — era 251 65.5 million years ago Key events in the Mesozoic view • edit … Wikipedia
cycadophyte — ▪ plant Introduction any member of a diverse collection of mostly extinct primitive gymnospermous plants. They probably had their origins among the progymnosperms of the Devonian Period (416 to 359 million years ago), possibly among a… … Universalium
plant — plantable, adj. plantless, adj. plantlike, adj. /plant, plahnt/, n. 1. any member of the kingdom Plantae, comprising multicellular organisms that typically produce their own food from inorganic matter by the process of photosynthesis and that… … Universalium
Timeline of plant evolution — This article attempts to place key plant innovations in a geological context. It concerns itself only with novel innovations and events that had a major global significance, not those that are of solely anthropological interest. The timeline… … Wikipedia
Cycas revoluta — This article is about the cycad sago palm. For the true sago palm, see Metroxylon sagu. Cycas revoluta Leaves and male cone of Cycas revoluta Conservation status … Wikipedia
Detailed logarithmic timeline — Main article: logarithmic timeline This timeline allows one to see the whole history of the universe, the Earth, and mankind in one table. Each row is defined in years ago, that is, years before the present date, with the earliest times at the… … Wikipedia