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--- 194607 [2016/04/29 12:59] – tyreless
+++ 194607 [2016/05/02 14:39] – tyreless
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 Second of two articles on a self-explanatory subject.
-====Part II. Walkabout In Paradise.
+====Part II. Walkabout In Paradise.====
 We have de-bussed at Wallacia once more, and my! what a mix-up. There is one grand melee as a mob of Sunday hiking types, bound for a big, tough weekend at Norton's Basin escape with our packs. Forthwith we holler out to them about their mistake, and with the matter rectified start out down the hill, once more on the way to Silverdale - and gold! On the bridge, we stop to change our clothes. All around is peace and silence, the Sunday hiking types having been side-tracked by a wayside kiosk. We wish that we could have the moon which last week lighted our path, but in its absence the Milky Way shines brilliant in the starry sky.
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 ----
-THE RECORD OF THE ROCKS
+=====The Record Of The Rocks.=====
-(By Trouper).
-Yeola - nearly all of us 'know this haven, but Most of us give.. - scarcply, more than a glance t the rocks from which we dive into the swimming pools,. Inded, it was the Same with me; I had been there before, and I had been happy just to laze about on the grassy bank.
+By Trouper.
-This time; as I took my plunge in the pool below the tent, something
-about tie rocks-arrested my attention. Previously, they hod caused no mental comment. - Slate, I had thought in walking over them to the water's edge",
+Yeola - nearly all of us know this haven, but most of us give scarcely more than a glance to the rocks from which we dive into the swimming pools. Inded, it was the same with me; I had been there before, and I had been happy just to laze about on the grassy bank.
-just plain ordinary grey slate." Now, however, my eyes lingered, for there 'was something different; something that elevated them above the level of "plain ordinary slate."
-The common forms of slate are a fine, uniformly-grey powder compacted into a rock which breaks into flake's. Far from Veing uniform, the grey in this slate was full of long, narrow streakst'in, an b.,3,;regate' of intermingled lines running more or less along the direction of tho river; a pattern not, unlike that of the fine, green, slimy tendrils of the vv ter weeds. I wondered if the pattern represented the remains of some such wed which had been growing amongst the muddy ooze from which this rock was formed in ages past. I stooped to examine them more closely, and as I did so, a pebble caught my eyes.
+This time, as I took my plunge in the pool below the tent, something about the rocks arrested my attention. Previously, they had caused no mental comment. "Hm - slate", I had thought in walking over them to the water's edge, "just plain ordinary grey slate." Now, however, my eyes lingered, for there was something different; something that elevated them above the level of "plain ordinary slate."
-Normally, there is ndtbAng unusual-in a pebble - but this one should not have been there, for it was firmly embedded in the slate. Pebbles just don't occur in slate, as a rule; slate ,b,egins its existence as a fine mud on the floor of a lake or sea. Rivers flowing into the lake sort their sediments well. First, W.ere the flow is fast, tiley drop their storms and pebbles, later to form conglomerate; next, where th flow lessensl sands aro deposited, giving sandstonesl-and finally, in the placid waters where there is little or no flow at all, the fine clay in the water is dropped, and from this comes shale and slate. But never is a pebble carried out far enough to be dropped ii the mud,
-Then how did this pebble get there? I looked around; there was another and yet another - half a dozen of theM. But how could they be amongst the mud? Nearly all were of the same colour as the slate, but definitely units of their own. No satisfactory explanation presented itself.
+The common forms of slate are a fine, uniformly-grey powder compacted into a rock which breaks into flakes. Far from being uniform, the grey in this slate was full of long, narrow streaks, in an aggregate of intermingled lines running more or less along the direction of tho river; a pattern not unlike that of the fine, green, slimy tendrils of the water weeds. I wondered if the pattern represented the remains of some such weed which had been growing amongst the muddy ooze from which this rock was formed in ages past. I stooped to examine them more closely, and as I did so, a pebble caught my eyes.
-Now, here was one of a different colour; a pale bluish-grey, with a translucent appearance. Was it a'pebble of smoky quartz? With my knife, I tried to scratch it - no, it was not quartz, for whereas a knife will not scratch quartz (which is too hard), this pebble scratched easily, Perhaps then, it was limestone? Limestone, why of course/ A limestone fossil: and so were all the others; here at Yeola, the relics of luring organisms.
-Eagerly, I lent to examine them anew, and found dozens of the relics! Yes, in those rock platforms, the fossils siuply abound. There -re two types of fossils in common occurrence, and both typos wer, found here. In the first, the organism drops into the mud and begins to decay. Fraction by
+Normally, there is nothing unusual in a pebble - but this one should not have been there, for it was firmly embedded in the slate. Pebbles just don't occur in slate, as a rule; slate begins its existence as a fine mud on the floor of a lake or sea. Rivers flowing into the lake sort their sediments well. First, where the flow is fast, they drop their stones and pebbles, later to form conglomerate; next, where the flow lessens, sands are deposited, giving sandstones, and finally, in the placid waters where there is little or no flow at all, the fine clay in the water is dropped, and from this comes shale and slate. But never is a pebble carried out far enough to be dropped in the mud.
-. ' .
-.
+Then how did this pebble get there? I looked around; there was another and yet another - half a dozen of them. But how could they be amongst the mud? Nearly all were of the same colour as the slate, but definitely units of their own. No satisfactory explanation presented itself.
-.. ' . . . :
-fraction, each decaying cell is replaced by minute particles of the mud, and as this process continues, taking years to complete, the mud retains part or all of the pattern of the animal, fish or plant which it is renlacing. These werc, rl "pebbles" which had the same colour as the ,slate they wre, in fact,- of tl same substance. It the second type of fossil, the actual bon-s of the anlinal etc. may be covered over by the muds, bolero they hlve time to decay.- The skeleton changes into the pale grey, soft limestone, so distinctive against tl' dark grey of the slate.
+Now, here was one of a different colour; a pale bluish-grey, with a translucent appearance. Was it a pebble of smoky quartz? With my knife, I tried to scratch it - no, it was not quartz, for whereas a knife will not scratch quartz (which is too hard), this pebble scratched easily. Perhaps then, it was limestone? Limestone, why of course! A limestone fossil! and so were all the others; here at Yeola, the relics of luring organisms.
-It does not need a geologist to find these fossils, for they are easily seen in the rock platform above the pool in front of the camp site They represent the remains of ancient shellfish, termed "spiriftra" (singular, "spirifor"), and you may see the actua limestone of thd shells, and in one or two isolated cases, there is, inside this limestone, the grey s3-4-- replacement of the internal orrmns.
-Spirif era wore brachiopods - i e. shellfish of a structure similar to cockles or muscles - which grew somewhat as shown in the drawing. The -outer (limestone) shell remains in many places, and in one instance - about half way across the top of the rock step some six
+Eagerly, I lent to examine them anew, and found dozens of the relics! Yes, in those rock platforms, the fossils simply abound. There are two types of fossils in common occurrence, and both types were found here. In the first, the organism drops into the mud and begins to decay. Fraction by fraction, each decaying cell is replaced by minute particles of the mud, and as this process continues, taking years to complete, the mud retains part or all of the pattern of the animal, fish or plant which it is replacing. These were the "pebbles" which had the same colour as the slate - they were, in fact, of the same substance. It the second type of fossil, the actual bones of the animal etc. may be covered over by the muds, before they have time to decay. The skeleton changes into the pale grey, soft limestone, so distinctive against the dark grey of the slate.
-w
-foot above the pool - is a specimen, some 3" across
+It does not need a geologist to find these fossils, for they are easily seen in the rock platform above the pool in front of the camp site. They represent the remains of ancient shellfish, termed "spirifera" (singular, "spirifer"), and you may see the actual limestone of ted shells, and in one or two isolated cases, there is, inside this limestone, the grey slate replacement of the internal organs.
- almost the whole of the shell preserved, and ZEC00)2,5)0 a clear cast of the internal organs. The spiral
-shown in the diagram represents the secendary
+Spirifera wore brachiopods - i.e. shellfish of a structure similar to cockles or muscles - which grew somewhat as shown in the drawing. The outer (limestone) shell remains in many places, and in one instance - about half way across the top of the rock step some six foot above the pool - is a specimen, some 3" across with almost the whole of the shell preserved, and a clear cast of the internal organs. The spiral shown in the diagram represents the secondary muscle used ,in opening and closing the turn shells; and in this particular specimen, there appears a clearly defined cross-section of this muscle, etched in slate.
-muscle used ,in opening and closing the turn shells;
-and in this particular specimen, thellp appears a clearly defined cross-section of this muscle, etched in slate.
+There is yet a third type of fossil, or rather, strictly speaking, not a fossil - and that is a cast. Instead of replacing the animal, etc. the muds might make a cast of them, just as a dentist might make a cast of a jaw before fitting false teeth. These shell casts - numbers of them - may be found here, along with the fossils, some casts being in the grey slates, and some in the chocolate-coloured cliffs on the far side, One such cast is depicted in the drawing, which is approximately life-size.
-There is yet a third type of fossil, or rather, strictly speaking, not a fossil - and that is a cast. Instead of 'replacing the animal,.etc. the muds: . might make a cast of them, just as a dentist might make a cast of-a jaw beIbre
-fitting false teeth. These shell casts - numbers of them - may be found here,' along with the fossils, some casts being in the grey
+Thus, when next you go to Yeola, with its buffalo grass on which to camp, blckberries to tickle the palate, and picturesque swimming pools in which to while away the hours, you may read a page of geology's history book; evidence from the seas of millions of years ago preserved in the rocks from which you dive.
-slates, and some in the 'chocolate-coloured cliffs on
-the far side, One such cast is depicted in the drawing, -Which is approximately life-size. '
-grass on which to camp, blckberries'to tickle the
-palate, and picturesque swimming pools in which to while away the hours, you may read a page of geology's history book; evidence from the seas of millions of years ag- 'preserved in the rocks from which you diltLe.
-:
-Thus, when next you go to Yeolal with its buffalo. .
 "POINTS FOR PRO32ECTIVES"
 by "Dingo".