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Granite rock, which is brought in by barge, is methodically placed in the Piankatank River near Gwynn’s Island in Mathews County Virginia. The rock is the basis for the newest, 25-acre oyster reef in the Chesapeake Bay Watershed. The Norfolk District, U.S. Army Corps of Engineers, is overseeing the more than $2 million sanctuary reef project in partnership with the Virginia Marine Resources Commission and the Nature Conservancy. (U.S. Army photo/Patrick Bloodgood)
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Massive, 1 cm-thick layer of light gray ash resting on a brown/reddish brown substrate of sandy clays with a sharp contact.
Size of thin section: 7x4 cm
Provenience: Open-air Hadza fire (see field photo of Hadza Fire 3). Sample collected in the summer of 2004.
Micromorphological Description: Massive layer of gray ash (light gray in thin section), 1 cm thick, resting on a burnt dark grayish brown substrate (brown/reddish brown in thin section) of sandy clays. The ash is composed of calcified wood and leaf cells mixed with charcoal fragments, pseudocarbonized plant tissue, and few dense nodules possibly representing animal residues . One phosphatic inclusion was identified as a coprolite. Very few mineral grains with thin iron-rich clay coatings are found scattered in the ashy groundmass, as well as rare brown soil aggregates ripped up from the underlying substrate . The top centimeter of the burnt substrate contains abundant browned to carbonized organic particles including plant cells, charcoal speckles and few whole rootlets . The groundmass shows a mosaic birefringence pattern with darker (organic-rich) zones and brighter ones. The porosity in this subsurface portion is composed of large vughs and channels, and these become more abundant with increasing depth. Below 1 centimeter, the organic fraction, which is the same as above, is only partly burnt or browned, and the charcoal fragments appear both fresh and reworked (rounded) . The birefringence fabric of the clayey groundmass below one centimeter is more distinct and homogeneous . The state of preservation of this hearth is excellent, as shown by the undisturbed position of the plant cells in the ash. Nevertheless, the presence of fresh rootlets throughout the sample, including through the ash layer indicates recent bioturbation.
Substrate: Picea abies, on stump.
Eesti punase nimestiku liik, ohualdis (VU).
Mõdriku, Lääne-Virumaa.
Lagrange County, Indiana
Lagrange County, Indiana
A calcareous fen is a natural community where groundwater seeping through a calcareous substrate (in this case, a gravelly glacial moraine) rises to the surface creating a unique, nutrient-poor wetland community of very interesting plant species. They are often referred to as a "hybrid" community since the plant association is an odd combination of plants from communities as divergent as bogs on the wet end to dry prairies on the dry end. It is very strange to see a pitcher plant growing near to Little Bluestem Grass, a plant typical of dry prairies. The pH is usually neutral or alkaline, and many of the plants are calciphiles.
The substrate in this fen is a combination of gravel, marl, muck and peat, and it is very soupy in places where one will sink into the mire. This fen is also a good example of what is called a "perched fen" or "hanging fen" because there is a distinct slope where the water emerges at a much higher level than the nearby river. The tall, large-leaved plant with yellow flowers is Prairie Dock (Silphium terebinthinaceum).
These photos were taken with a 10-24mm Nikkor lens (the equivalent of a 15-36mm on my camera). This was my first opportunity to use it, and I think I'm going to like it for landscape-style natural community shots.
Photo of car interior in Portland Oregon mounted on Plywerk maple plywood substrate. Photo taken by photosbykim.com
Substrate: Populus tremula.
Eesti punase nimestiku liik, ohustatud (EN).
Keskkonnaameti 2013. a andmeil on kuni 2010. aastani Eestist leitud 6 korral.
Oru, Põhja-Kõrvemaa.
Orchid substrate and aquarium charcoal should work, right? My hope is that they will help retain water and prevent fungus growth, plus I happened to have both in the house.