tufa

1 Given its eastern location, this could be a great last hike before exiting the park, and is easily combined with a visit to Mono Lake and its otherworldly tufa formations.

2 With its parapets, ceramic tile roofs and multitiered buildings perched on layers of red volcanic tufa stone, Pitigliano resembles a sparkling, pint-size Holy City.

3 As the saline lake retreated, rock formations called tufa, which had formed underwater, were left exposed along the shorelines.

4 Keeping to the valley, on our right are now some huge blocks of tufa, of great interest as part of the ancient Roma Quadrata, anterior to Romulus.

5 Spires of limestone tufa rise from the shores of California's Mono Lake.

图为石灰石泉华柱耸立在加利福尼亚的莫诺湖之滨.

6 Remains of fortifications of all ages run round the edge of the hill; some of the original Greek work, in finely hewn rectangular tufa blocks, exists on the east.

7 The marshrutka weaves through Republic Square, which is encircled by elegant 20th-Century government buildings and museums built from pink volcanic tufa stone.

8 The lake and its surroundings were protected as parkland in large part to preserve the lake’s tufa towers — knobby limestone spires that rise high above the water’s surface and make for a wonderfully Seussian sight.

9 From the House of the Surgeon it is but a little way to that of Sallust, a larger residence, and one of later date, when tufa had displaced limestone as a building material.

10 The volcanic tufa used by the earliest Roman builders was discarded gradually in favour of better materials.

11 It is best known for its calcium-carbonate “tufa towers,” which are spires formed by the interaction of freshwater springs and the alkaline water, but the lake also serves a huge number of birds.

12 The implications stretch from Owens Lake north to Mono Lake, the high-desert water body east of Yosemite National Park best known for its cragged and towering tufa formations.

13 Now exposed in dry valleys, this porous tufa was a natural insulation used by pioneers to build their homes with a natural protection against summer heat and winter cold.

14 As Chips writes, tufa is a type of porous limestone rock that creates a habitat for alpine and other rock garden plants.

15 Under certain conditions calcium carbonate is concentrated at or near the earth's surface by chemical agencies, as about springs where calcareous tufa, travertine, etc., are precipitated, and in caverns where stalactites and stalagmites are formed.

16 “The Foreau has ripe fruit, but is dry and refreshing with a mineral character from those chalky, tufa soils.”

17 The treasury was raised on a quadrangular structure, supported on its south side by the Hellenico, and built of tufa.

18 In the morning, kick off the day’s driving with a 30-minute excursion to visit the enormous sapphire tarn of Mono Lake, an alkaline expanse freckled with tufa spires, pinnacles formed by calcium carbonate interacting with freshwater springs in the lakebed.

19 The word also suggests the porous limestone, or tufa, that gives Mr. Marsicano’s home, and others in the area, their uniform, beige color.

20 In the narrow descent that led to it Mr. Wood showed me in three consecutive strata the tufa of the time of the kingdom, travertine of the republic, and brick of the empire.

1 石灰华

calc-tufa travertine travertin tuff calctuff calc-sinter

2 灰华

tophus

3 泉华

sinter

4 凝成岩

tuff

5 华

flower flores