Moreover, if erosion has blurred the record by removing substantial portions of the deformed sedimentary rock, it may not be at all clear which edge of a given layer is the original top and which is the original bottom. Identifying top and bottom is clearly important in sequence determination, so important in fact that a considerable literature has been devoted to this question alone. Many of the criteria of topвbottom determination are based on asymmetry in depositional features.
Oscillation ripple marks, speed dating nyc free example, are produced in sediments by water sloshing back and forth. When such marks are preserved in sedimentary rocks, they define the original top and bottom by their asymmetric pattern. Certain fossils also accumulate in a distinctive pattern or position that serves to define the top side. In wind-blown or water-lain sandstonea form of erosion during deposition of shifting sand removes the tops of mounds to produce what are called cross-beds.
The truncated layers provide an easily determined depositional top direction. The direction of the opening of mud cracks or rain prints can indicate the uppermost surface of mudstones formed in tidal areas.
You can also transfer pictures to your Mac with Photos app, iPhoto, or Preview, which is just as simple and actually has a virtually identical interface for initiating the transfer. Here is how to import with Preview:. On a Windows PC the easiest way to get pictures from your iPhone is to just use Windows Explorer, but there are two ways to go about this. In either case, unlock the iPhone before beginning, or else the photos may not be visible. This utilizes the AutoPlay pop-up that shows by default in Windows when a device is connected to the speed dating nyc free by way of USB.
This is the easiest way to access and copy pictures from iPhone to a Windows PC:. Opening either will work to copy the pictures over, but typically Digital Camera opens directly to the DCIM directory whereas Portable Devices will sometimes require minor navigation within the folder to copy the files.
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I have my Strat and an old Gibson.