Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Ancient Forest Emerges From Beneath Takapuna Beach


Ancient Forest Emerges From Beneath Takapuna Beach

In recent days the sand near low water in the middle of Takapuna Beach, Auckland, has shifted and exposed the long buried remains of an ancient forest.

Many long-time locals say they have never seen it before, although some of the soft sticky mud that it is buried in has been uncovered in other parts of the beach on odd occasions in the past.


Auckland geologist Bruce Hayward visited the newly exposed fossil forest this week. “This is an exciting new discovery and is quite different and much older than Takapuna Reef’s famous fossil forest preserved in the lava flows from Pupuke Volcano”, he says.


“This new fossil forest consists of many small tree stumps in growth position in an ancient soil. It is clear that the trees became established on the surface of a thick white rhyolitic ash deposit, and in turn they have been buried and preserved by another thick creamy-white volcanic ash bed”. Similar thick rhyolitic ash and ignimbrite deposits occur in a number of low-lying parts of Auckland. Elsewhere they have been dated at close to 1 million years old and were erupted by gigantic explosive blasts from a volcano in the vicinity of Mangakino, near Taupo.

A similar sequence of white volcanic ash and peat occurs in Shoal Bay and was exposed a few years ago by earthworks when the Esmonde Rd interchange for the northern motorway was being enlarged. Similar aged fossil forests are permanently visible in eastern and southern Auckland in low sea cliffs at Pakuranga, Takanini and Waiuku.

“The fossil tree stumps and fallen branches and twigs are black, but they have not been burnt” says Dr Hayward, “instead they have been carbonised during their preservation and fossilisation. A specialist could study their cell structure and identify the kinds of trees present. Most of the trees are small and less than 15 cm diameter, but larger trees were in the neighbourhood as I found a large lump of kauri gum in the ancient soil.”

In places the volcanic ash has weathered to clays and is soft and sticky but in some places it has been hardened by remineralisation and some of these rocks stick up 30 cm above the present beach level.

History tells us that it will not be too long before the sands shift back and once again bury Takapuna Beach’s hidden secret – the oldest fossil forest on the North Shore.

Ends


ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Cosmetics & Pollution: Proposal To Ban Microbeads

Cosmetic products containing microbeads will be banned under a proposal announced by the Minister for the Environment today. Marine scientists have been advocating for a ban on the microplastics, which have been found to quickly enter waterways and harm marine life. More>>

ALSO:

NIWA: 2016 New Zealand’s Warmest Year On Record

Annual temperatures were above average (0.51°C to 1.20°C above the annual average) throughout the country, with very few locations observing near average temperatures (within 0.5°C of the annual average) or lower. The year 2016 was the warmest on record for New Zealand, based on NIWA’s seven-station series which begins in 1909. More>>

ALSO:

Farewell 2016: NZ Economy Flies Through 2016's Political Curveballs

Dec. 23 (BusinessDesk) - New Zealand's economy batted away some curly political curveballs of 2016 to end the year on a high note, with its twin planks of a booming construction sector and rampant tourism soon to be joined by a resurgent dairy industry. More>>

ALSO:


NZ Economy: More Growth Than Expected In 3rd Qtr

Dec. 22 (BusinessDesk) - New Zealand's economy grew at a faster pace than expected in the September quarter as a booming construction sector continued to underpin activity, spilling over into related building services, and was bolstered by tourism and transport ... More>>

  • NZ Govt - Solid growth for NZ despite fragile world economy
  • NZ Council of Trade Unions - Government needs to ensure economy raises living standards
  • KiwiRail Goes Deisel: Cans electric trains on partially electrified North Island trunkline

    Dec. 21 (BusinessDesk) – KiwiRail, the state-owned rail and freight operator, said a small fleet of electric trains on New Zealand’s North Island would be phased out over the next two years and replaced with diesel locomotives. More>>

  • KiwiRail - KiwiRail announces fleet decision on North Island line
  • Greens - Ditching electric trains massive step backwards
  • Labour - Bill English turns ‘Think Big’ into ‘Think Backwards’
  • First Union - Train drivers condemn KiwiRail’s return to “dirty diesel”
  • NZ First - KiwiRail Going Backwards for Xmas
  • NIWA: The Year's Top Science Findings

    Since 1972 NIWA has operated a Clean Air Monitoring Station at Baring Head, near Wellington... In June, Baring Head’s carbon dioxide readings officially passed 400 parts per million (ppm), a level last reached more than three million years ago. More>>

    ALSO:

    Get More From Scoop

     
     
     
     
     
     
     
     
    Sci-Tech
    Search Scoop  
     
     
    Powered by Vodafone
    NZ independent news