To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Salvage excavations of a nearly complete and remarkably well-preserved skeleton of an American mastodont (Mammut americanum) in Licking County, Ohio, yielded a discrete, cylindrical mass of plant material found in association with articulated vertebrae and associated ribs. This material is interpreted as intestinal contents of the mastodont and paleobotanical analyses indicate that the mastodont diet included significant amounts of low, herbaceous vegetation. Enteric bacteria (Enterobacter cloacae), isolated from a sample of this material, are believed to represent survivors or descendants of the intestinal microflora of the mastodont. This is the first report of the isolation of bacteria associated with late Pleistocene megafauna.
Some aspects of the paleolimnology of Browns Lake, Ohio, have been ascertained by a study of preserved sedimentary plant pigments and conductivity of interstitial water. Temporal changes in the sedimentary environment, especially redox conditions, along with changes in the flora of the lake and the development of peat in the basin have brought about differential sedimentation and preservation of pigments. Measurement of changes in total and relative concentration and diversity of chlorophyll derivatives and carotenoids has provided important clues to late-glacial and postglacial evolution of the lake. Laminated sediments, rich in fossil remains, near the base of the core indicate eutrophic conditions and meromixis for several thousand years beginning shortly after lake inception. As meromixis broke down, the lake evolved gradually to holomictic conditions when sapropel was deposited. An advancing complex of reed swamp and fen forest began during midpostglacial time, providing ever-increasing amounts of highly organic, peaty sediments and continues to the present. The pond is now dystrophic, and increasing deposition of inorganic sediment is apparent at the top of the core, concomitant with land clearance and agriculture. In the same interval, an increase of water conductivity reflects recent agricultural practices and industrialization in the region.
Email your librarian or administrator to recommend adding this to your organisation's collection.