The Physical Conditions Indicated By the Flora of the Calvert Formation
The Physical Conditions Indicated By the Flora of the Calvert Formation
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Midway between the apex and the base, where the leaf is consequently widest, they are subopposite, as are the corresponding secondaries.
These characteristic leaves are not uncom- mon, but like most of the plant material in the Calvert formation they are usually much broken. Their size, form, and texture are indicative of barren soil, bright sunshine, and sparse rainfall. Compared with existing spe- cies they are found to resemble the toothed leaves sometimes developed on Quercus vir- giniana M...iller, a coastal species of southeastern North America, which is also abundant in the Pleistocene and which in the form of Quercus jyrevirginiana Berry is exceedingly abundant in the PUocene of the Gulf coast. Most of the leaves of Quercus virginiana are oblong, elliptical, or obovate with merely undulate margins, and the significance of the occasional toothed leaves is unknown. A modem species with which Quercus lehmanni may be more legitimately compared is Quercus emoryi Torrey.
The latter has the small narrow leaves with rounded bases and irregular teeth.
What to read after The Physical Conditions Indicated By the Flora of the Calvert Formation?
You can find similar books in the "Read Also" column, or choose other free books by Edward Wilber Berry to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Midway between the apex and the base, where the leaf is consequently widest, they are subopposite, as are the corresponding secondaries.
These characteristic leaves are not uncom- mon, but like most of the plant material in the Calvert formation they are usually much broken. Their size, form, and texture are indicative of barren soil, bright sunshine, and sparse rainfall. Compared with existing spe- cies they are found to resemble the toothed leaves sometimes developed on Quercus vir- giniana M...iller, a coastal species of southeastern North America, which is also abundant in the Pleistocene and which in the form of Quercus jyrevirginiana Berry is exceedingly abundant in the PUocene of the Gulf coast. Most of the leaves of Quercus virginiana are oblong, elliptical, or obovate with merely undulate margins, and the significance of the occasional toothed leaves is unknown. A modem species with which Quercus lehmanni may be more legitimately compared is Quercus emoryi Torrey.
The latter has the small narrow leaves with rounded bases and irregular teeth.
What to read after The Physical Conditions Indicated By the Flora of the Calvert Formation?
You can find similar books in the "Read Also" column, or choose other free books by Edward Wilber Berry to read onlineMoreLess
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