VII. BLUE MUD.

After last night's rain, the cliffs that bound the bay have come out in all their most brilliant colours; so this morning I am turning my steps seaward, and wandering along the great ridge¹ of pebbles² which here breaks the force of the Channel waves as they beat against the long line of the Dorset downs. Our cliffs just at this point are composed of blue lias beneath, with a capping of yellow sandstone on their summits, above which in a few places the layer of chalk that once topped the whole country-side has still resisted the slow wear and tear of unnumbered centuries. These three elements give a variety to the bold and broken bluffs³ which is rare along the monotonous⁴ southern escarpment of the English coast. After rain, especially, the changes of colour on their sides are often quite startling in their vividness and intensity⁵. To-day, for example, the yellow sandstone is tinged⁶ in parts with a deep russet red, contrasting admirably with the bright green of the fields above and the sombre steel-blue of the lias belt below. Besides, we have had so many landslips along this bit of shore, that the various layers of rock have in more than one place got mixed up with one another into inextricable confusion. The little town nestling in the hollow behind me has long been famous as the head-quarters of early geologists⁷; and not a small proportion of the people earn their livelihood⁸ to the present day by 'goin' a fossiling.' Every child about the place recognises ammonites as 'snake-stones;' while even the rarer vertebrae of extinct saurians have acquired a local designation as 'verterberries.' So, whether in search of science or the picturesque⁹, I often clamber down in this direction for my daily stroll, particularly when, as is the case to-day, the rain has had time to trickle¹⁰ through the yellow rock, and the sun then shines full against its face, to light it up with a rich flood of golden splendour.

The base of the cliffs consists entirely¹¹ of a very soft and plastic blue lias mud. This mud contains large numbers of fossils, chiefly chambered shells, but mixed with not a few relics¹² of the great swimming and flying lizards¹³ that swarmed¹⁴ among the shallow flats or low islands of the lias sea. When the blue mud was slowly accumulating in the hollows of the ancient bottom, these huge saurians formed practically the highest race of animals then existing upon earth. There were, it is true, a few prim¹⁵?val kangaroo-mice and wombats¹⁶ among the rank brushwood of the mainland; and there may even have been a species or two of reptilian¹⁷ birds, with murderous-looking teeth and long lizard-like tails—descendants of those problematical creatures which printed their footmarks on the American trias, and ancestors of the later toothed bird whose tail-feathers have been naturally lithographed for us on the Solenhofen slate¹⁸. But in spite of such rare precursors¹⁹ of higher modern types, the saurian was in fact the real lord of earth in the lias ocean.
For him did his high sun flame, and his river billowing ran,
And he felt himself in his pride to be nature's crowning race.

We have adopted an easy and slovenly²⁰ way of dividing all rocks into primary, secondary, and tertiary, which veils from us the real chronological²¹ relations of evolving life in the different periods. The lias is ranked by geologists among the earliest secondary formations: but if we were to distribute all the sedimentary rocks into ten great epochs, each representing about equal duration in time, the lias would really fall in the tenth and latest of all. So very misleading to the ordinary mind is our accepted geological nomenclature. Nay²³, even commonplace geologists themselves often overlook the real implications of many facts and figures which they have learned to quote glibly²⁴ enough in a certain off-hand way. Let me just briefly²⁵ reconstruct the chief features of this scarcely recognised world's chronology as I sit on this piece of fallen chalk at the foot of the mouldering²⁶ cliff, where the stream from the meadow above brought down the newest landslip during the hard frosts of last December. First of all, there is the vast lapse²⁷ of time represented by the Laurentian rocks of Canada. These Laurentian rocks, the oldest in the world, are at least 30,000 feet in thickness, and it must be allowed that it takes a reasonable number of years to accumulate such a mass of solid limestone²⁸ or clay as that at the bottom of even the widest prim?val ocean. In these rocks there are no fossils, except a single very doubtful member of the very lowest animal type. But there are indirect traces of life in the shape of limestone probably derived²⁹ from shells, and of black lead probably derived from plants. All these early deposits have been terribly twisted and contorted by subsequent convulsions of the earth, and most of them have been melted down by volcanic³⁰ action; so that we can tell very little about their original state. Thus the history of life opens for us, like most other histories, with a period of uncertainty³¹: its origin is lost in the distant vistas³² of time. Still, we know that there was such an early period; and from the thickness of the rocks which represent it we may conjecture³³ that it spread over three out of the ten great ?ons into which I have roughly divided geological time. Next comes the period known as the Cambrian, and to it we may similarly assign about two and a half ?ons on like grounds. The Cambrian epoch²² begins with a fair sprinkling of the lower animals and plants, presumably developed during the preceding age; but it shows no remains³⁴ of fish or any other vertebrates. To the Silurian, Devonian, and Carboniferous periods we may roughly allow an ?on and a fraction each: while to the whole group of secondary and tertiary strata³⁵, comprising almost all the best-known English formations—red marl, lias, oolite, greensand, chalk, eocene, miocene, pliocene, and drift—we can only give a single ?on to be divided between them. Such facts will sufficiently³⁶ suggest how comparatively modern are all these rocks when viewed by the light of an absolute chronology. Now, the first fishes do not occur till the Silurian—that is to say, in or about the seventh ?on after the beginning of geological time. The first mammals are found in the trias, at the beginning of the tenth ?on. And the first known bird only makes its appearance in the oolite, about half-way through that latest period. This will show that there was plenty of time for their development in the earlier ages. True, we must reckon the interval³⁷ between ourselves and the date of this blue mud at many millions of years; but then we must reckon the interval between the lias and the earliest Cambrian strata at some six times as much, and between the lias and the lowest Laurentian beds at nearly ten times as much. Just the same sort of lessening³⁸ perspective exists in geology as in ordinary history. Most people look upon the age before the Norman Conquest as a mere³⁹ brief episode of the English annals; yet six whole centuries elapsed between the landing of the real or mythical⁴⁰ Hengst at Ebbsfleet and the landing of William the Conqueror⁴¹ at Hastings; while under eight centuries elapsed between the time of William the Conqueror and the accession of Queen Victoria. But, just as most English histories give far more space to the three centuries since Elizabeth than to the eleven centuries which preceded them, so most books on geology give far more space to the single ?on (embracing the secondary and tertiary periods) which comes nearest our own time, than to the nine ?ons which spread from the Laurentian to the Carboniferous epoch. In the earliest period, records either geological or historical are wholly wanting; in the later periods they become both more numerous and more varied⁴² in proportion as they approach nearer and nearer to our own time.

So too, in the days when Mr. Darwin first took away the breath of scientific Europe by his startling theories, it used confidently to be said that geology had shown us no intermediate form between species and species. Even at the time when this assertion was originally made it was quite untenable. All early geological forms, of whatever race, belong to what we foolishly call 'generalised' types: that is to say, they present a mixture of features now found separately in several different animals. In other words, they represent early ancestors of all the modern forms, with peculiarities⁴³ intermediate between those of their more highly differentiated⁴⁴ descendants; and hence we ought to call them 'unspecialised' rather than 'generalised' types. For example, the earliest ancestral horse is partly a horse and partly a tapir: we may regard him as a tertium quid, a middle term, from which the horse has varied in one direction and the tapir in another, each of them exaggerating certain special peculiarities of the common ancestor and losing others, in accordance with the circumstances in which they have been placed. Science is now perpetually discovering intermediate forms, many of which compose an unbroken series between the unspecialised ancestral type and the familiar modern creatures. Thus, in this very case of the horse, Professor Marsh⁴⁵ has unearthed⁴⁶ a long line of fossil animals which lead in direct descent from the extremely unhorse-like eocene type to the developed Arab of our own times. Similarly with birds, Professor Huxley has shown that there is hardly any gap between the very bird-like lizards of the lias and the very lizard-like birds of the oolite. Such links, discovered afresh every day, are perpetual denials to the old parrot-like cry of 'No geological evidence for evolution.'

1 ridge   

n.山脊；鼻梁；分水岭

参考例句：

• We clambered up the hillside to the ridge above.我们沿着山坡费力地爬上了山脊。
• The infantry were advancing to attack the ridge.步兵部队正在向前挺进攻打山脊。

2 pebbles   

[复数]鹅卵石； 沙砾； 卵石，小圆石( pebble的名词复数 )

参考例句：

• The pebbles of the drive crunched under his feet. 汽车道上的小石子在他脚底下喀嚓作响。
• Line the pots with pebbles to ensure good drainage. 在罐子里铺一层鹅卵石，以确保排水良好。

3 bluffs   

恐吓( bluff的名词复数 )； 悬崖； 峭壁

参考例句：

• Two steep limestone bluffs rise up each side of the narrow inlet. 两座陡峭的石灰石断崖耸立在狭窄的入口两侧。
• He bluffs his way in, pretending initially to be a dishwasher and then later a chef. 他虚张声势的方式，假装最初是一个洗碗机，然后厨师。

4 monotonous   

adj.单调的，一成不变的，使人厌倦的

参考例句：

• She thought life in the small town was monotonous.她觉得小镇上的生活单调而乏味。
• His articles are fixed in form and monotonous in content.他的文章千篇一律，一个调调儿。

5 intensity   

n.强烈，剧烈；强度；烈度

参考例句：

• I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
• The strike is growing in intensity.罢工日益加剧。

6 tinged   

v.（使）发丁丁声( ting的过去式和过去分词 )

参考例句：

• memories tinged with sadness 略带悲伤的往事
• white petals tinged with blue 略带蓝色的白花瓣

7 geologists   

地质学家，地质学者( geologist的名词复数 )

参考例句：

• Geologists uncovered the hidden riches. 地质学家发现了地下的宝藏。
• Geologists study the structure of the rocks. 地质学家研究岩石结构。

8 livelihood   

n.生计，谋生之道

参考例句：

• Appropriate arrangements will be made for their work and livelihood.他们的工作和生活会得到妥善安排。
• My father gained a bare livelihood of family by his own hands.父亲靠自己的双手勉强维持家计。

9 picturesque   

adj.美丽如画的，（语言）生动的，绘声绘色的

参考例句：

• You can see the picturesque shores beside the river.在河边你可以看到景色如画的两岸。
• That was a picturesque phrase.那是一个形象化的说法。

10 trickle   

vi.淌，滴，流出，慢慢移动，逐渐消散

参考例句：

• The stream has thinned down to a mere trickle.这条小河变成细流了。
• The flood of cars has now slowed to a trickle.汹涌的车流现在已经变得稀稀拉拉。

11 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

12 relics   

[pl.］n.遗物，遗迹，遗产；遗体，尸骸

参考例句：

• The area is a treasure house of archaeological relics. 这个地区是古文物遗迹的宝库。
• Xi'an is an ancient city full of treasures and saintly relics. 西安是一个有很多宝藏和神圣的遗物的古老城市。

13 lizards   

n.蜥蜴( lizard的名词复数 )

参考例句：

• Nothing lives in Pompeii except crickets and beetles and lizards. 在庞培城里除了蟋蟀、甲壳虫和蜥蜴外，没有别的生物。 来自辞典例句
• Can lizards reproduce their tails? 蜥蜴的尾巴断了以后能再生吗？ 来自辞典例句

14 swarmed   

密集( swarm的过去式和过去分词 )； 云集； 成群地移动； 蜜蜂或其他飞行昆虫成群地飞来飞去

参考例句：

• When the bell rang, the children swarmed out of the school. 铃声一响，孩子们蜂拥而出离开了学校。
• When the rain started the crowd swarmed back into the hotel. 雨一开始下，人群就蜂拥回了旅社。

15 prim   

adj.拘泥形式的，一本正经的；n.循规蹈矩，整洁；adv.循规蹈矩地，整洁地

参考例句：

• She's too prim to enjoy rude jokes!她太古板，不喜欢听粗野的笑话！
• He is prim and precise in manner.他的态度一本正经而严谨

16 wombats   

n.袋熊( wombat的名词复数 )

参考例句：

• The Wombats:Not big difference. 袋熊：没有很大的区别。 来自互联网
• Wombats wanted to wiggle along the ground. 袋熊想在地面上扭动前进。 来自互联网

17 reptilian   

adj.（像）爬行动物的；（像）爬虫的；卑躬屈节的；卑鄙的n.两栖动物；卑劣的人

参考例句：

• The chick is ugly and almost reptilian in its appearance. 这只小鸡长得很丑，看起来几乎像个爬行动物。 来自辞典例句
• Being from Orion do Zetas contain DNA from the Reptilian race? 齐塔人是从猎户座而来，DNA来自爬虫族吗？ 来自互联网

18 slate   

n.板岩，石板，石片，石板色，候选人名单；adj.暗蓝灰色的，含板岩的；vt.用石板覆盖，痛打，提名，预订

参考例句：

• The nominating committee laid its slate before the board.提名委员会把候选人名单提交全体委员会讨论。
• What kind of job uses stained wood and slate? 什么工作会接触木头污浊和石板呢？

19 precursors   

n.先驱( precursor的名词复数 )；先行者；先兆；初期形式

参考例句：

• Phenyl (or polyphenyl) substituted epoxides serve as excellent precursors to phenyl (or diphenyl) carbenes. 某些苯代（或多苯）环氧乙烷是制取带苯环（或二苯）碳烯的极好原料。 来自辞典例句
• Note the presence of megakaryocytes, erythroid islands, and granulocytic precursors. 可见巨核细胞，红细胞岛和粒细胞前体细胞。 来自互联网

20 slovenly   

adj.懒散的，不整齐的，邋遢的

参考例句：

• People were scandalized at the slovenly management of the company.人们对该公司草率的经营感到愤慨。
• Such slovenly work habits will never produce good products.这样马马虎虎的工作习惯决不能生产出优质产品来。

21 chronological   

adj.按年月顺序排列的，年代学的

参考例句：

• The paintings are exhibited in chronological sequence.这些画是按创作的时间顺序展出的。
• Give me the dates in chronological order.把日期按年月顺序给我。

22 epoch   

n.(新)时代；历元

参考例句：

• The epoch of revolution creates great figures.革命时代造就伟大的人物。
• We're at the end of the historical epoch,and at the dawn of another.我们正处在一个历史时代的末期，另一个历史时代的开端。

23 nay   

adv.不；n.反对票，投反对票者

参考例句：

• He was grateful for and proud of his son's remarkable,nay,unique performance.他为儿子出色的，不，应该是独一无二的表演心怀感激和骄傲。
• Long essays,nay,whole books have been written on this.许多长篇大论的文章，不，应该说是整部整部的书都是关于这件事的。

24 glibly   

adv.流利地，流畅地；满口

参考例句：

• He glibly professed his ignorance of the affair. 他口口声声表白不知道这件事。 来自《现代汉英综合大词典》
• He put ashes on his head, apologized profusely, but then went glibly about his business. 他表示忏悔，满口道歉，但接着又故态复萌了。 来自《现代英汉综合大词典》

25 briefly   

adv.简单地，简短地

参考例句：

• I want to touch briefly on another aspect of the problem.我想简单地谈一下这个问题的另一方面。
• He was kidnapped and briefly detained by a terrorist group.他被一个恐怖组织绑架并短暂拘禁。

26 mouldering   

v.腐朽( moulder的现在分词 )；腐烂，崩塌

参考例句：

• The room smelt of disuse and mouldering books. 房间里有一股长期不用和霉烂书籍的味道。
• Every mouldering stone was a chronicle. 每块崩碎剥落的石头都是一部编年史。 来自辞典例句

27 lapse   

n.过失，流逝，失效，抛弃信仰，间隔；vi.堕落，停止，失效，流逝；vt.使失效

参考例句：

• The incident was being seen as a serious security lapse.这一事故被看作是一次严重的安全疏忽。
• I had a lapse of memory.我记错了。

28 limestone   

n.石灰石

参考例句：

• Limestone is often used in building construction.石灰岩常用于建筑。
• Cement is made from limestone.水泥是由石灰石制成的。

29 derived   

vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取

参考例句：

• Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
• He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》

30 volcanic   

adj.火山的；象火山的；由火山引起的

参考例句：

• There have been several volcanic eruptions this year.今年火山爆发了好几次。
• Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。

31 uncertainty   

n.易变，靠不住，不确知，不确定的事物

参考例句：

• Her comments will add to the uncertainty of the situation.她的批评将会使局势更加不稳定。
• After six weeks of uncertainty,the strain was beginning to take its toll.6个星期的忐忑不安后，压力开始产生影响了。

32 vistas   

长条形景色( vista的名词复数 )； 回顾； 展望； （未来可能发生的）一系列情景

参考例句：

• This new job could open up whole new vistas for her. 这项新工作可能给她开辟全新的前景。
• The picture is small but It'shows broad vistas. 画幅虽然不大，所表现的天地却十分广阔。

33 conjecture   

n./v.推测，猜测

参考例句：

• She felt it no use to conjecture his motives.她觉得猜想他的动机是没有用的。
• This conjecture is not supported by any real evidence.这种推测未被任何确切的证据所证实。

34 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

35 strata   

n.地层（复数）；社会阶层

参考例句：

• The older strata gradually disintegrate.较老的岩层渐渐风化。
• They represent all social strata.他们代表各个社会阶层。

36 sufficiently   

adv.足够地，充分地

参考例句：

• It turned out he had not insured the house sufficiently.原来他没有给房屋投足保险。
• The new policy was sufficiently elastic to accommodate both views.新政策充分灵活地适用两种观点。

37 interval   

n.间隔，间距；幕间休息，中场休息

参考例句：

• The interval between the two trees measures 40 feet.这两棵树的间隔是40英尺。
• There was a long interval before he anwsered the telephone.隔了好久他才回了电话。

38 lessening   

减轻，减少，变小

参考例句：

• So however much he earned, she spent it, her demands growing and lessening with his income. 祥子挣多少，她花多少，她的要求随着他的钱涨落。 来自汉英文学 - 骆驼祥子
• The talks have resulted in a lessening of suspicion. 谈话消减了彼此的怀疑。

39 mere   

adj.纯粹的；仅仅，只不过

参考例句：

• That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
• It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。

40 mythical   

adj.神话的；虚构的；想像的

参考例句：

• Undeniably,he is a man of mythical status.不可否认，他是一个神话般的人物。
• Their wealth is merely mythical.他们的财富完全是虚构的。

41 conqueror   

n.征服者，胜利者

参考例句：

• We shall never yield to a conqueror.我们永远不会向征服者低头。
• They abandoned the city to the conqueror.他们把那个城市丢弃给征服者。

42 varied   

adj.多样的，多变化的

参考例句：

• The forms of art are many and varied.艺术的形式是多种多样的。
• The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。

43 peculiarities   

n. 特质, 特性, 怪癖, 古怪

参考例句：

• the cultural peculiarities of the English 英国人的文化特点
• He used to mimic speech peculiarities of another. 他过去总是模仿别人讲话的特点。

44 differentiated   

区分，区别，辨别( differentiate的过去式和过去分词 )； 区别对待； 表明…间的差别，构成…间差别的特征

参考例句：

• The development of mouse kidney tubules requires two kinds of differentiated cells. 小鼠肾小管的发育需要有两种分化的细胞。
• In this enlargement, barley, alfalfa, and sugar beets can be differentiated. 在这张放大的照片上，大麦，苜蓿和甜菜都能被区分开。

45 marsh   

n.沼泽，湿地

参考例句：

• There are a lot of frogs in the marsh.沼泽里有许多青蛙。
• I made my way slowly out of the marsh.我缓慢地走出这片沼泽地。

46 unearthed   

出土的（考古）

参考例句：

• Many unearthed cultural relics are set forth in the exhibition hall. 展览馆里陈列着许多出土文物。
• Some utensils were in a state of decay when they were unearthed. 有些器皿在出土时已经残破。