how does a imprint fossil form?

Answer 1

Soft sediment is compacted around the organic remains and bound together by cement. The organic remains can then decay away (leaving a void), can remain in some form, or may be replaced by minerals wihch occur in the water in the rocks (eg. calcium carbonate which is also a good cement). An imprint (mold) will be left in the rocks around the void or fossil.

Answer 2

Imprint Fossil

Answer 3

Most fossils are not just imprints in the sediment. The best fossils are usually preserved by being permineralized by siliceous material like quartz. Most fossils like dinosaur bones and wood are preserved in sediment mixed with volcanic ash called bentonite or montmorillonite. This ash is made up of volcanically pulverized granite or rhyolite mixed with ground up granite. Then the fossil organic remains dissolve and leave a hollow space or mold in which later minerals fill and hard into the shape of the original hard parts of the organism. These are called steinkerns and are usually marine shells. Better preserved fossils are penetrated by ground water which carries minerals (usually silicon or quartz a natural glass) into the bone or wood and preserves some of the original organic structure intact. This has been a recent discovery and has not been publicized since it is hard to explain if the bone is indeed millions of years old, when the soft tissues inside a T-rex bone are found to contain soft tissue sealed in quartz. It is also interesting that Carbon 14 is also found in all fossil bones and wood which dates them at thousands of years.

Answer 4

Due to pressure and temperature in the absence of oxygen and moisture