The earth is very old, about 4.55 billion years old. If the earth is old, isotopes with short half lives should have decayed already. And they have. Testing of radioactive elements in meteorites, which formed at the same time as the earth, give an age of 4.55 billion years. (Powell, Mysteries of Terra Firma, p. 45-73). Please see here.
There are also varves, which are deposits of annual sediment layers in lakes. The rate of sedimentation is consistent with the other dating techniques. Some varve formations have millions of layers. Please see here.
There are Loess (wind blown silt) deposits in China that are over 300 m thick. They give a consistent climate record for over 7.2 million years. The Loess deposits are verified by fossils and magnetostratigraphy. Please see here.
Tree rings, which are often used to date past events in human history, show a history of 8,000 years. Please see here.
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