Hockham Mere is the site of a former lake, >400 metres diameter, in Norfolk, England. Its biogenic sediments contain a late-Devensian & Holocene pollen record.

The lake was 1.2 miles (1.9 km) west of Great Hockham in Breckland. It formed over 10,000 years ago, probably by dissolution and collapse of the underlying chalk bedrock.[1] Worked flint tools discovered on the fringes of the former lake suggest that it was an area of significant Mesolithic occupation.[2] In Tudor times it was a large lake, and was drained over the next two centuries. It had dried up by the middle of the 18th century.[1] It is now an area of swampy land and carr woodland, known as Cranberry Rough.

Pollen data

Hockham Mere pollen data shows the rates of change in levels of vegetation using pollen samples from the Holocene period.

This data can be analysed using temperature proxies to help determine climate change in the area at that time. These proxies can be the amount of pollen found in the sample, as more pollen would indicate higher flora productivity which would suggest a warmer climate. The same can be seen if data shows negligible amounts of pollen which would suggest a cooler climate. These are proxies for temperature, and not an accurate record as there are many variances that cannot be monitored easily.[3]

References

  1. 1 2 "Cranberry Rough". Breaking New Ground. Retrieved 18 December 2020.
  2. ↑ "Norfolk Heritage Explorer". Norfolk County Council. Retrieved 18 December 2020.
  3. ↑ Bennett, K. D. (November 1983). "Devensian Late-Glacial and Flandrian Vegetational History at Hockham Mere, Norfolk, England. I. Pollen Percentages and Concentrations". The New Phytologist. 95 (3): 457–487. doi:10.1111/j.1469-8137.1983.tb03512.x. JSTOR 2434313.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.