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Geologists have long known that the land in this region has had an up-and-down existence in the past. Shells discovered far above present sea level show that the land has risen. And forests at sea level indicate that it has also fallen.

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Relentless work of the sea has uncovered a number of tree trunks and logs in what would appear to be an early stage of carbonisation.
"A most interesting exposure," was the comment of Mr W. A. Pullar, soil bureau officer at Gisborne. With Dr. Wellman, oil geologist, Mr Pullar is making sparetime study of buried forests, later hopes to get age of samples determined by radio-carbon process.

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General view at Sponge Bay showing where erosion has uncovered forest

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Two samples of logs which are on the way to becoming coal