A shallow marine seismic reflection study has clarified the evolution of the landscape around Franchthi Cave in SE Greece during the post-glacial sea-level rise. In late Palaeolithic and Mesolithic times the site, near a sizable river, overlooked a wide coastal plain. Around 9,000 B.P. the shoreline began to approach the present coast forming a possibly enclosed lagoon and later a bay. About 6,000 B.p.flow in the river decreased. An extensive Neolithic settlement may have been located between the river bank or bayshore and the cave. Sea level reached -5 m. ca. 3,000 years ago and remained there until late Roman times, but sedinlentation increased greatly during that period, probably as a result of soil erosion.

Data transmission by bouncing off i o n i z e d m e t e o r t r a i l s p r o v i d e s a r e l i a b l e means of communications up t o 2000 km, w i t h o u t t h e u s e of r e p e a t e r s . T h i s p a p e r w i l l p r o v i d e a n i n t r o d u c t i o n t o meteor b u r s t technology and i t s g e n e r a l a p p l ic a t i o n f o r t h e t e l e m e t r y of oceanographic d a t a . O p e r a t i o n a l f e a t u r e s of t h e SNOTEL s y s t e m

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The Johns 'Hopkins Glacier in Glacier Bay, Alaska and the Columbia Glacier, near Valdez was looked a t underwater w i t h the Klein Side Scan Sonar w i t h a one degree beam width. More correctly, the bases o f the glaciers were studied with reference to the moraine formation build-up i n front of the glacier as well as bottom contours and configurations o u t t o 300 meters i n front of the glaciers. A number of slides were prepared from these records and these were compared with slides of aerial photos o f the gl aci ers .What i s shown i n these slides are the apertures i n the moraines where the water from the me1 t i ng glaciers runs into the bay and the extent of these apertures. clear in terms of what i s being seen. As the Side Scan patterns are ninety degrees i n the vertical plane, the images for overhang ice are. spatially confusing and i t i s certain that whileThe bottom records of the glaciers are unthe novice a t this work cannot-distinguish characteristics, i t i s equally certain that with experience (and some underwater diving and photography work) these featuses would become distinguishable. Even as the experienced Side Scan operator can distinguish a suspended pipe on a long pipe1 ine run while the novice cannot t e l l what he i s looking at, i t i s f e l t t h a t considerably more work must be done, preferably by the same operator, before these features could be defined w i t h any accuracy. Reference i s made t o the work done by PeterBenedict of Memori a1 University in Newfound1 and and broad discussions of the problem of portraying the underwater characteristics of icebergs.I t is felt that there is a tremendous amount o f work t o be done i n using such records intelligently and that a great deal more information will be gained from the same records after an operator gains experience i n reading them.

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