,,guide ,,to ,,the ,,norris ,,geyser ,,basin #ae ,illustration3 uncaptioned ,,norris ,,geyser ,,basin ,the ,norris ,geyser ,basin was named for ,philetus ,w4 ,norris who served as ,yellowstone's second superintendent from #ahgg until #ahhb4 ,although he did not discover it1 his explorations and reports were largely responsible for calling attention to that area4 ,norris is considered to be the hottest and most active geyser basin in ,yellowstone4 ,here geysers and hot springs exhibit greater change in activity over a short span of time than elsewhere in the park4 ,it is not unusual for a new hot spring to come into existence literally overnight4 ,the new feature may last for just a few days or perhaps a month or so2 upon occasion some have endured for many years4 ,because of constant change in the thermal features1 the ground here is unstable and hazardous in many locations4 ,therefore1 you are required to stay on designated trails and boardwalks at all times4 ,this not only protects you from possible serious burns but also helps preserve the features as well4 ,remember also not to throw any objects into thermal features4 ,debris of any kind in a hot spring or geyser could clog the vent and destroy the feature4 ,because many scalding hot pools and run-off channels are near trails and boardwalks1 pets are not permitted on the trails4 ,the fact that thermal features change may come as a surprise1 but remember that geysers1 hot springs and other thermal phenomena are subject to natural stresses just like plant and animal communities4 ,of course the changes in thermal activity result from a different set of factors than those affecting plants and animals4 ,can you guess what they might be8 ,shifts in the earth's crust 7earthquakes7 result in movements along cracks and fissures in the ground4 ,these tremors usually cause changes in the underground 8plumbing systems0 of thermal features1 thus altering activity patterns4 ,look for signs of recent activity variations as you walk along the trails1 or ask a naturalist if there have been some recent changes4 ,as you explore1 look closely at the often intricate formations around the edges of a few hot pools1 geysers and in some thermal runoff channels4 ,you will notice a mineral called sinter or geyserite 7a form of silicon dioxide1 ,si,o7 being deposited like tiny spines4 ,these rather prickly formations result when geyserite is deposited from slightly acid water1 a characteristic of most thermal water in the ,norris area4 ,this is in contrast to the bead-like structures that result when geyserite forms from slightly alkaline water found in thermal features in the ,old ,faithful area4 ,notice too the variety of colors staining the basins4 ,the refraction 7breaking up7 of light1 mineral deposits and living organisms1 algae and bacteria1 all add their hues4 ,the assortment of colors reflects variations in water temperature and chemistry4 ,as you enjoy your walk remember that ,norris is a great natural preserve where nature is constantly at work designing and redesigning one of its most unusual displays4 ,we are only visitors here and must not spoil it in any way4 ,it also serves as a great natural research laboratory where scientists from all over the world learn more about geothermal energy4 ,help us preserve this unique area so that the next generation and those who follow can come and enjoy it in the same grandeur you did4 ,the ,norris ,geyser ,basin is made up of two or more less separate areas called ,porcelain ,basin and ,back ,basin4 ,both basins are served by trails which begin at the ,norris ,museum and are shown on this map4 ,the following briefly describes a few features in each4 ,,thermal ,,features ,,in ,,porcelain ,,basin ,,valentine ,,geyser--,located at the base of a large pear-shaped alcove1 ,valentine is a typical cone type geyser that first erupted on ,valentine's ,day1 #aijg4 ,its activity has varied considerably--being dormant some seasons1 erratic during others1 yet showing a high degree of regularity at times4 ,during the past several seasons1 it has erupted from a minimum of once every two days to a maximum of once a day4 ,an eruption lasts #e-g minutes and reaches a height of #bj-ej feet 7#f-ae m47 above the seven foot cone4 ,the eruption is followed by a steam phase lasting an hour4 ,,ledge ,,geyser--,the largest geyser in the ,porcelain ,basin1 changed dramatically after an earthquake that occurred ,june #cj1 #aige4 ,in #aigd it had been erupting about twice a day1 but after the quake ,ledge was dormant for nearly two years4 ,then during the summer of #aigg it had but two eruptions4 ,check the prediction board at the museum to see if ,ledge ,geyser is active this year4 ,,africa ,,geyser--named for the spring that preceded it which was roughly the shape of the continent4 ,the spring became a geyser in ,february of #aiga4 ,at first it was intermittent but as time passed the periods between eruptions grew shorter until it became a constant geyser4 ,in #aigg it was always powerful--sometimes emitting a mixture of steam and water2 other times just steam4 ,,the ,,whirligigs ,,and ,,constant ,,geysers--these three features seem to be interconnected4 ,constant ,geyser1 dormant for several years1 reactivated in the early '#gj's and now erupts up to #cj feet 7#i m47 once or twice an hour2 often prior to an eruption of one of the ,whirligigs4 ,in recent years1 ,big and ,little ,whirligig have traded active periods4 ,when one is more active1 the other is less4 ,watch for the #ae foot 7#d m47 angled plume from ,little ,whirligig's orange vent or listen to the distinctive chugging produced during ,big ,whirligig's splashing eruption4 ,as with many geysers1 the water level rises in these pools prior to an eruption4 ,,ebony ,,and ,,bear ,,den ,,geysers--are another set of related features4 ,in the '#fj's ,bear ,den ,geyser first appeared and as it increased in activity1 ,ebony ,geyser became dormant4 ,today ,bear ,den ,geyser erupts in bursts1 arcing up to #dj feet 7#ab m47 from the den-like vent1 four to six times daily4 ,the death of ,ebony ,geyser may have been hastened by objects thrown into its vent by thoughtless visitors4 ,this debris is cemented into place by the silica deposited from the water1 choking off the vent4 ,minute ,geyser in the ,back ,basin may have suffered a similar fate4 ,,thermal ,,features ,,in ,,back ,,basin ,,emerald ,,spring--,the colors in and around thermal features are often created by several kinds of algae that grow in hot water4 ,however1 the deep green color of this spring is a result of a combination of the yellow color from the sulphur lining the edge of the pool with the blue that is refracted 78scattered07 from the clear water in the pool4 ,the bowl of this feature is about #bg feet 7#h m47 deep and the temperature normally varies between #aid and #bjj degrees ,f4 7#ij-ic ,c47 ,,steamboat ,,geyser--,the world's largest geyser1 ,steamboat has eruptions of more than #cjj feet 7#ia meters74 ,it was largely dormant for nine years1 then startled observers in ,march #aigh with a full-scale eruption4 ,the water phase lasted approximately #bj minutes1 followed by bellowing steam for over #dj hours4 ,this spectacular display inundated the immediate area4 ,at this writing1 ,march #cj1 #aigh1 it is not known if ,steamboat's eruptions will follow any pattern4 ,between #aifa and ,march #aifi1 it had a total of #ajc major eruptions1 none of which could be predicted4 ,you can still see the effects of downpouring water on the landscape which killed trees and scoured away soil4 ,the nine-year respite allowed new lodgepole pines to gain a foothold4 ,we hope you are fortunate enough to witness ,steamboat ,geyser and share in the excitement4 ,remember--protect camera and eye glass lenses from the spray as it can scratch glass after drying4 ,,cistern ,,spring--,in #aiff this feature changed from a grayish-black color to its present brilliant blue4 ,concurrent with this the overflow increased killing many trees near the spring4 ,since then a silica terrace has rapidly built up4 ,when ,steamboat had a major eruption the water level in ,cistern dropped #d-h feet1 7#a4b-b4d m47 with a corresponding drop in water temperature of around #fj degrees ,f4 ,this seems to indicate some connection between the two features4 ,whether or not the increased water output of ,cistern has resulted in the decline of ,steamboat is still unknown4 ,,echinus ,,geyser 7-k-ns7--although not as well known as some other geysers1 erupts in a display that surpasses many of them4 ,the name comes from the sinter spine-covered rocks surrounding the pool which bear a fanciful resemblance to spiny sea urchins4 ,echinus was the ,greek name for these tide-pool dwellers4 ,stop and watch the water fill the basin and begin to boil4 ,soon it will be propelled skyward in great explosive bursts of steam and water1 some reaching heights of over #ge feet 7#bc m474 ,usually the eruptions last three to six minutes but in #aigg ,echinus was erupting for up to twelve minutes4 ,after erupting the pool drains and begins to refill4 ,intervals between eruptions may be as short as #de minutes or better than #ge minutes4 ,listen for the peculiar gurgling sound produced as the vent drains after each eruption4 ,,vixen ,,geyser--,although its usual eruptions are small compared to others 7#e-ae feet every few minutes71 the geyser is unique in that water comes from a circular tub-like vent4 ,during normal activity little water is ejected4 ,occasionally ,vixen may have major eruptions of considerable water1 lasting #e to #ej minutes and playing up to #cj feet4 ,listen for the peculiar gurgling sound produced as the vent drains after each eruption4 ,,today',s ,,geyser ,,predictions 7,obtain data from the museum prediction board or from a naturalist74 ,echinus ,ledge ,valentine ,others ,text written by ,george ,a4 ,algard1 ,norris ,summer ,naturalist #c_/gd #d_/gh ,illustration3 ,,norris ,,geyser ,,basin ,,back ,,basin ,phillip's ,caldron ,grey ,lakes ,green ,dragon ,spring ,yellow ,funnel ,spring ,palpitator ,spring ,pearl ,geyser ,vixen ,geyser ,black ,hermit's ,caldron ,minute ,geyser ,mt4 ,holmes 7#aj1ccf feet--#cafj meters7 visible to the northwest ,veteran ,geyser ,monarch ,geyser ,crater ,emerald ,spring ,bathtub ,spring ,,porcelain ,,basin ,ebony ,geyser ,bear ,den ,geyser ,crackling ,lake ,whale's ,mouth ,dark ,cavern ,geyser ,arch ,steam ,vent ,cistern ,spring ,,norris ,,museum ,steamboat ,geyser ,valentine ,geyser ,lodge ,geyser ,little ,whirligig ,geyser ,sieve ,lake ,africa ,geyser ,pinwheel ,geyser ,echinus ,geyser ,hurricane ,vent ,colloidal ,pool ,congress ,pool ,ragged ,spouter ,blue ,geyser ,feisty ,geyser ,carnegie ,drill ,site ,parking ,porcelain ,terrace ,springs ,nuphar ,lake ,,legend trails and boardwalk described thermal features other thermal features roads and parking ,,to ,,madison--#af ,,miles--#bf ,,km ,,to ,,mammoth ,,hot ,,springs--#bb ,,miles--#ce ,,km ,,to ,,campground-- ,,mile-- ,,km ,,to ,,canyon ,,village--#ab ,,miles--#ai ,,km ,,dangerous ,,thermal ,,area ,boiling ,water--,thin ,crusts ,always ,stay on ,constructed ,walkways ,transcriber's ,notes --,silently corrected a few typos4 --,retained publication information from the printed edition3 this e,book is public-domain in the country of publication4 --,in the text versions only1 text in italics is delimited by underscores4